Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c6de3a954818f4…

MALICIOUS

PDF

89.1 KB Created: 2021-09-03 21:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 203302deb5b22422e04b434750517ce4 SHA-1: 75e7ac0cfc335c4cdc7ba8f1e6e52cd6bbbce5d4 SHA-256: 85c6de3a954818f4a71cc2c5332c4589d832ec91ef7148a99ec966869aa92ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the nature of the links and the PDF structure indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba21d558c2---rodojijopovexu.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/22082118042.pdfIn PDF document text
    • http://santeh.md/img/files/88701300905.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/wajojemufufomodu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6fd8f58eb79fff10f4478b5a7d0770d7/14430898413.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210605_232934.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/vilabebejebutad.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7d452332---fepibuz.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/63545907844.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nomepisolapexumi.pdfIn PDF document text
    • http://farmina.ru/uploads/files/53414690679.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/58978757647.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g3vb0b147j4p5cggus7kg4lv5a/vefozefimukepuwis.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d31d685b87a2d218f08976e4308ef339/piwofu.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/17531546074.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e13cd17dd---pufav.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bmom4q8p6g10dks46d39u2108p/jigozaboreno.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/papadogavopu.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/zedej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f812d403---bijovosumujevaderatavovi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8ca0d9188---dadewi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0644409df8fd5f5bfda81fd7c99d9b99/busurunajaz.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79397926876.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/rijalakixujevukinubukekig.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e581f180a7debccf82d9bd08d072b6f/xivozubowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=disorders+of+the+endocrine+system+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_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 10792 bytes
SHA-256: 66d033ebaf746c7326644df5af3f5e7dd03d4fabcb1d5b126bf8291a685a5b51
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 18352 bytes
SHA-256: d2cdd9b7011bb002b26c52e32e04344f14036352cabc004857c2e63537d6935f
font_02_sfnt_off00013e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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