Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b2eee6e69263c2…

MALICIOUS

PDF

82.5 KB Created: 2021-08-26 13:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f330f674a4877a13b853af9846407398 SHA-1: daf35dbb6fd1b2b3febf20e2c2a57e08e37cf2c3 SHA-256: a9b2eee6e69263c21b41515cfac2de308b90fb964c77609619bca9a86140a7e4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The document body was unreadable, but the heuristic firings strongly indicate a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://widepolymers.com/userfiles/file/migawilakapolexunolesebeb.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87132cf7f0---pazikuvutuna.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/zutatigafiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26a8c7a238---tavagopiximexo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fbce8338---16091768925.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f7klg11j6hi5ekr5vqnaq80n6/mexemebaru.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7501efd14---nuwejomere.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/gizogi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8f4cfbfcbeb848a7d727d85448daf351/tasivodi.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/xagesekalog.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/velibalepotu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774d7e982eb---bewopalapetazelulafijokop.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd138da6f---30579464838.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xabozupekitum.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1257826585610f1a434790f.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/o2sulsoqkkhqdr3r5590upm906/34489858859.pdfIn PDF document text
    • http://montrealpsychologist.org/clients/c/c9/c9c46cd79ea88ac5ae94f64bb0de8c36/File/47387433156.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608462db7b36c---17742815629.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/49879154729.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cf945723---59641266404.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb31545e00---46807105670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=petulantly+in+a+sentencePDF 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 17108 bytes
SHA-256: 418e4dd2a2fa20afbd12a37dfb93bf60eb8d7d41b323614b50f5b177b8f1413d
font_01_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 10216 bytes
SHA-256: b5a7dda43490ca4f9a7a12c2ebc46836497ff34fca18b077cbbbca7cc78e980f
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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