Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0f4f949f2f870b…

MALICIOUS

PDF

81.4 KB Created: 2021-08-23 09:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 033aa35c7f0eef33a80301d7023525a3 SHA-1: 090d2976aefde0adc02efe406b74fa752f5be8cb SHA-256: 3a0f4f949f2f870b83b017b64ab21fbe6ec75c81fc0b477dc53ad83ea67bb3b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and potentially disposable hosting. The embedded URLs, including one using a raw IP address, suggest an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/17364763851.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/c0786c6e6cbd27aaf5f53ef98d6e78a8/16943724404.pdf
    • http://tdvvietnam.vn/webroot/img/files/venonovuderopitozepodazoz.pdf
    • http://iehyun.com/editorupload/file/vojegaridegusozudov.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/j89lei0pia0c1osrm0tfr09tmm/12219236388.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f7bca5a18---91916942902.pdf
    • http://dr-onesrl.com/userfiles/files/49006580828.pdf
    • http://shannonlakeestates.org/fck_images/file/28085258693.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c10e3a05---movorubatolololewufum.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/daxofimebotazetosu.pdf
    • http://goddesshair.net/upload/users/files/59728270942.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/10218208100.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t03q5mhllqnub3uk6a7hioe0hc/67005594624.pdf
    • http://hotelamadeustorino.com/userfiles/files/74421366800.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/dinewumujowenox.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d528a87dc129bb834eadb339346e2301/99380258243.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/somaposodumo.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf739797a1---63670911290.pdf
    • http://innotec-industrie.be/userfiles/file/60783658528.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/468saf2quj04mjdtioctbjiod3/84736839237.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a6e6bbaead3c0449faa6110c461d9b95/73341569793.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=positioning+strategy+in+marketing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7b.bin
fda6f2e5b9aaa45cb06c44a5b2b00f1740bd4b7e8a819a2d468e6c2689cc0579
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 15732 bytes
font_01_sfnt_off000106bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 16792 bytes
font_02_sfnt_off00011ed6.bin
513c74cf98b1d1cf552b56ecd37e056ccb0fb92fa819f5f456136b2a0df3e9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 10612 bytes