Malicious PDF — malware analysis report

Static analysis result for SHA-256 279029593d684b0b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 21:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2eb2bedc4b33ff825615b428c80d5e8b SHA-1: 2aa40b4eccba00223ff90d6b13688e4a970e2cf3 SHA-256: 279029593d684b0b5b7b8be970b04295fa321aefefd938c93bd0a8bed91e12db
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://dcimx.com/files/86544154698.pdf In PDF document text
    • http://kleinschadenexperte.de/userfiles/file/24665707499.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/sujas.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/duxumalevaxisowa.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bf928b4791905028ae57b8b274423005/gamalisajuvusonon.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/fofiritisasogaf.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/zakurudotek.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/nojumina.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/20584491027.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6kcuevmfsrlpuksqma7gqbecnb/gasomomifemepokilogez.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/34541170173.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/28183403876.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/maketafefalem.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090106261673499.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/5610472211.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/73488006497.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613848a40f10e---83771888257.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/3964854831.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/zalikigekog.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/71151465697.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/54732178736.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/90093030064.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/65944380793.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210911082132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=versteckte+ssid+finden+androidPDF 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_off0000c480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 10484 bytes
SHA-256: 60493b259deb746f74d376f9a4e971053ffb06d03fc2e955cc6a2a407a7d08ea
font_02_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 21484 bytes
SHA-256: 823b1a45499a324c301d5aab31e1abea44fdfffc3c11a58c9a82d6a75324fe11

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