Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6ba4cbc18fb2be…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 05:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7b495ab34d51b3b93f786756b2abd926 SHA-1: 020c298805869d042bc25d4d18d4c89f42d7d7cb SHA-256: 3e6ba4cbc18fb2be33ad4c9fab91df33e4fb15c0b20104d560c74cf57ff2a71d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm used to distribute further malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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 https://lemarko.com/userfiles/file/82757336518.pdf In PDF document text
    • http://chretkinia.pl/userfiles/file/29354110460.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ba3g9vq4c5ohfkbmu1jb58mvlc/85920290121.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/dosobizabamuwiwojo.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/24561571601.pdfIn PDF document text
    • https://eslms.com/userfiles/file/51157802655.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/65085396796.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/00037ae9825364743fc3a0bc7b3b0cfd/89362582189.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/18437856635.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/se6t4mil879o7kal071ak81ou6/4548105684.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rrnhebnht34id26i66dam60kvr/fetukovivozofizinas.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/50572494159.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/lubite.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/mokawinajis.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/gugabirajesomusij.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/rinusa.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/55683660950.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0542f152---5496830322.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/dded00690c9b9ddc0c387d256a318cda/3329748829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=guglielmo+tell+libretto+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10688 bytes
SHA-256: 0036b1c7c130b91871bc0663f85e2f99b59acf470fc4512bfec91995b19f2028
font_02_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 20244 bytes
SHA-256: f421f4945e653d0093e1ccb65769a1d0d2077f00300542fa475e889a08a62304

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