Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaff7e07c950158c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 02:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7651e5f98eefb86198091f273293195a SHA-1: 102bf5e7987139a50c741caf81c8ebb2f907314a SHA-256: aaff7e07c950158cae95527a32b1c46e76c0860af79911b88bae9ca13d7f2b2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://turagent007.ru/userfiles/file/refumapij.pdf In PDF document text
    • http://pmrs.ps/userfiles/file/84245212325.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/lomanokujofexepapuzurabot.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109272d57e9c---perubafekaluxal.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/5972032902.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wenedirazidazawezejiw.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/13704766385.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae63d9c652e---98600195167.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/7e92457bfb6b468d505c8c802dce15b8/49362162016.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/12253797503.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/tapikipanu.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/78062623545.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3ec7053b---jigujojazojufages.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a2973bc8---mowafebosibubug.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d719f24a80d---melodejore.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/susurebalexinugag.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160856e5620c9d---dufafatesejumod.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/47477709090.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784eb42dc4b---42095510080.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0fc29d92---89410041937.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/snqm1vig9i50l12cerlkajqvod/muridivir.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/gawekewamidumutolomudamig.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/0a63eb9033e287ccf58e0b8956af7bec/82911026720.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/soxaneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=using+commas+semicolons+and+colons+worksheetsPDF 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 17696 bytes
SHA-256: 902d8865ac2d06fe9308a76a2db5c1b6eb0c39647793000fb966a762e6ace439
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 11000 bytes
SHA-256: c4f4ee77e0f762c1599c00377474e39286360fd7886dce08f1d15b1dfa238c52

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