Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47ab0e78f0dbbaf…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 03:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f65451630e52ca84b0aa63607d0ed40a SHA-1: be5bccf6cbcdf94b41a3b66ae49f3bb2b5ba4067 SHA-256: c47ab0e78f0dbbaf70335b6b90c73be1aaebd2a07a89ab564f0e2ef56961a23c
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users into downloading further malicious content, as indicated by multiple heuristics flagging it as a link farm on disposable hosting and compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hasdeu.md/data/userfiles/files/xanusokitag.pdf In PDF document text
    • https://monyetmesum.com/contents//files/60027132845.pdfIn PDF document text
    • http://e-sheremet.com/img/zomifodiwuvekanodimu.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b5189061b8265ad73d4e92450756b555/62070763993.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/tuzumotuputi.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/15581543888.pdfIn PDF document text
    • https://losungversorger.com/product/file/salututujuvadikazub.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7db2105da26110911309b0236c1a8018/kexaxeborusitusigu.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/pogoveruretamiru.pdfIn PDF document text
    • http://splogservice.ru/content/file/jatifota.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096ee9a790fc---44862455116.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/5267164136.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bugetivufukisonam.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/83bb3c2e8c3159b547a6f19ccc166852/zafeminadukax.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e651c53cce7586e3273621b0c3f242cf/43584769997.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/90764160907.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/vozew.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/35129171854.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210619052037.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3db922a8403b7340d70ff4ead77e44eb/zodevegelawadanero.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/zotirozazuv.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04af20cd1---dozuluxuvotiwafufuba.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/30899127145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=java+complete+reference+8th+edition+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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 11068 bytes
SHA-256: c5bb48dc2f739c0732aed5817b6f1d2b972b45f81cc49251f0ab7511bc530171
font_02_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 18108 bytes
SHA-256: bdd34895dce854171cb5255c7e5980a0c20693c9f5cb2447c1b20abb51c7bb1e