Malicious PDF — malware analysis report

Static analysis result for SHA-256 1affac37de8676d1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8705fdd2f296853828fb295335933699 SHA-1: 869ca53b6873da32ec51384b5da912bf8b1d2ebf SHA-256: 1affac37de8676d11e7e81608bac12c2929bfee9778af5be99a3ba788d1c9ccd
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ags-car.com/upload/files/wefalur.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2hcq34bndtr74hfa5bu9s57fgf/zisamukudezumaj.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4083795304.pdfIn PDF document text
    • http://guowangcable.com/d/files/3674020315.pdfIn PDF document text
    • https://cartolmania.it/file/dalobiboz.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/sexitidom.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/56e99301f1ab758efe1091bcfe21f50c/kalijavatisod.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/06oo6aqvaf5eg6diq28m7lb6pj/dosukitagunoxobepijew.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zonojipe.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b9281dc8---74241825165.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zoleni.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/44336dfd76ca97dea9840843fa390272/fesesajegamipebu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/botolek.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/944941a52a5021e494d437a94cb9b65c/vedukunaxumolotirete.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42fc0b623a---rewen.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/konesawogikazurosetaku.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052109283441.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/jebatazibofowazam.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/tugulix.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9e9f08b4---292559613.pdfPDF link annotation
    • http://hyundaihungthinh.com/uploads/images/files/delida.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/timopi.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/tadegimewetiwalivokurut.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/70677181023.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/31999704268.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/jiliwupowatikewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=malabsorption+syndrome+in+pediatrics+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_off0000d3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A9 16952 bytes
SHA-256: f36d3e3911a63371e54a81b7a667b11987bf3621482b5cb8eb5c669b22633176
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 11028 bytes
SHA-256: f8ab1ceffc2ce2f77f26c5efe54226451731110cf44aba3de51d9f3498838b5c