Malicious PDF — malware analysis report

Static analysis result for SHA-256 4869e71451b1f1fc…

MALICIOUS

PDF

90.3 KB Created: 2021-07-23 23:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e52c93df0e37d9916b149b758082953b SHA-1: 6cf6525c864b0389a341fbdbe822894deec8e302 SHA-256: 4869e71451b1f1fc8269c44631b204d0820ef80cb933ab47c845787dd7d34f7f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to compromised WordPress sites, some of which are IP-literal addresses, suggesting an attempt to host malicious content. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious intent, likely to trick users into downloading further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b985dad4a9---86427514199.pdf PDF link annotation
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fedf3e3254a7f774dfabc8157bee462a/29915631097.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/n3m9k522j7qpfhkjhu8tnaqck2/jusujugojameselujuxopariz.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/keletemakejamogego.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/34693371815.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73b9f55f66db442befac3a997cbb827f/wufezuzifabujovazeb.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/58153497576.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f1c38fa5e---ruxorokexipovikinezalezi.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/88642086292.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/969ff3ba6d775d0c56a6af2c88e89a10/53092540313.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/15258001604.pdfIn PDF document text
    • https://citytrafik.nu/images/file/16729130290.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6df41434ce6edb7964695c15202d549/23252821743.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/dufebedofedababovaseler.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608840ca3f57c---14046899942.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/60991101783.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/34874530410.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66e29f07c---mudop.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/31313966715.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/cb625c4f0413fdfd71b53393b55f8c00/tivukodibaragewijetipiz.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/sqkavbvokmjqbo9sjdc8tspbm1/nijodurubogedekovatizu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/20651671371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=alien+shooter+free+hack+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013b9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13B9F 18704 bytes
SHA-256: cfb1bebaa56dbf372651f5796151a567536a9c3f1850ddc22657dc5c11820697
font_00_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 10876 bytes
SHA-256: 6cba6577b5b6ffffa9bb654a116129b37997d8e2bfef5499b3711ce7bce990c0
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 17112 bytes
SHA-256: 4229ca09e753c5ca542aedb758112efc0c2b415063b2013a7a6ea851233946e8

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