Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0d26bca958d8d0…

MALICIOUS

PDF

108.1 KB Created: 2021-07-17 09:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a354cc53744e084008bdad685d493705 SHA-1: a7037f0f54a3469272c4fe1c7295db604063b413 SHA-256: cc0d26bca958d8d02e09afa270b88465c417641cbe46355dfe0b9f9715736987
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. The document contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://theartofdesign.nl/ckfinder/userfiles/files/76274849595.pdf In PDF document text
    • http://bakoca.hu/files/file/jazudazubovejapedikivo.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/2caa756c99adbaad2f75d1626c18f663/93941191259.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/tubupedarevujatibukuvi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t0med0ivlq0mv1dkph99s3c527/78071611969.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/8992093978.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a1402f0e---fepedatevodum.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16082996741d99---tojibiboniwefatus.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/bemiso.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/49937350844.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5j7vas7et0q24ogc0mh2rdi572/xegupuxetojija.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/zupewupudazavusomebaden.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/81538744057.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/26029922201.pdfIn PDF document text
    • https://tonitomov.com/picture/file/rulovuperigo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160708d0d36b1f---46715795143.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7b0d1415---zisizajurenetixalawa.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/a35nj7rm1b404g6vt0737nrk36/suloganabatutixebit.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/90327826161.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ttgdij70quehlsqif528jnkl8b/27070892349.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b6518f318160afe26b811b82555012da/38624816185.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/34c2c344d05e1eef9575251fa89543cb/xuropo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/e98qkacc2dfidadhr2o6f1cv47/94672118823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=biblical+meaning+of+number+104PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 10956 bytes
SHA-256: eaee61b2260a3acb513b8046e9c3a9a77a3027fe48b4a22df424aa9201752b6c
font_02_sfnt_off00014c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C00 19524 bytes
SHA-256: 16f56a11659630404ffaf24eff34abea2a288b446fbbd8fddbf378ef8a561f50
font_03_sfnt_off00016d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5D 20816 bytes
SHA-256: 3fbe42f99cda462a3fdc1dd61d2d540136c4d68fac4c278d5802f6b46091dabf

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