Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a79cd50ead994c2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 22:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e53adbf6706d59a1d8184a8152f25346 SHA-1: f9e23d2083cd081af52bf93a9f38750f70858fa6 SHA-256: 2a79cd50ead994c2e31dd41b45dc4d107f87bc5eaab9dca6db67a0b24877c54f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to other PDFs hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malware. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cy2hand.com/userfiles/suzisanerut.pdf In PDF document text
    • http://loscogliodifavignana.it/userfiles/files/19254758591.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/dijomoke.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tubadotowojamodalaromewe.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/80648287384.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/9612742375.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/89687447672.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kewoxerubakalefuguv.pdfIn PDF document text
    • http://belniig.by/public/file/kikomuzevifulewi.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/01111020610.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/23010661366.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sapirogipip.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/wejumazutasonalol.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/92616164696.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/77431582405.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/65263672199.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0f195029---wovinime.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5fabeb2a---jotogebitemopeme.pdfIn PDF document text
    • https://ms02bet.com/contents/files/93986269996.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/ridetisixat.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/kupotudeb.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161310b4d7981f---tuwuredebagulakorapud.pdfIn PDF document text
    • http://santeh.md/img/files/wajijimole.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613122e0dc35a---28588742226.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011608224395.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/ziwerukomozanusadog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pc+das+english+grammar+book+pdf+free+downloadPDF 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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 18772 bytes
SHA-256: 0437215c48626ac50b891f8a06c62bf2d5d9732150094e606d9a0c3d0495aada
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 11288 bytes
SHA-256: 3b01f7ca8753c6f8b7b83c152cfbc40eedd8ab64bc3450cb1d8f03ade68a5f7e

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