Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e82e9621301bda…

MALICIOUS

PDF

127.4 KB Created: 2021-06-29 22:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a27ea3a2fe92197cb86587b4046aeb0 SHA-1: eb5a57b6191bd86312137408de6bf976e42242d2 SHA-256: f6e82e9621301bda97df19fc73f2bd19472b53dcc8b9de63a1cfc4b066612cd1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body was unreadable, but the link farm structure is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4939f0b464027d13a3b659c092474f7a/2154143339.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b9912b3c---90416888048.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607df62512b5e---kalexogivuxovewa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5f96098e---59544786317.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4q059a9p3sdshvrsaegnl2ns4u/bilor.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/3938335224.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/33960156740.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mgtdb2uchl1jcn0884ts1d2g13/vezegujavolunaputuzirale.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce32d8126---35851185392.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pirupu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607815990116d---960990295.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836958edd48---bitopozawisamekodisiwet.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160943146cfd4f---lemebipetudevoz.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf0e57e1e1---vufavemivag.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/sivokavodagi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088789a5a915---bonitetoxux.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/011df420cfd35eac6930c051906c1d34/386500741.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/raroxedifesawoxa.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9e1407583f33906a37afdf794ffa6559/51852255723.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/42146263485.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/rumageruzilijevexaw.pdfIn PDF document text
    • http://france-ex.com/14402946895.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/34tbjnihep19nh2e2o1kdbnck3/27869292010.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f82232a6c2178c7b91d7cab447ed0d0d/bojabumeremabudemogef.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c2e92fe04---78341768962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+speech+that+is+fully+prepared+in+advancePDF 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_off000191e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9FF 10856 bytes
SHA-256: 7937073fd2dc971227f61e8ec50c3852068388606f9860a5caf5ea6d00d7678c
font_02_sfnt_off0001c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C315 17208 bytes
SHA-256: ac5fcd1ec9dcac5c3e1cafa4611950ef1b373823503017a4fd9214fa83fd7dc5

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