Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc266f171deab52f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 08:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4025a01677da3ec6a7c4e1c4616d111c SHA-1: 4a6f9d2d7eb1b675a0dc79c93f86fe61b3468667 SHA-256: cc266f171deab52f434d45a6401b0f00d88e6fb8d290376ebb6072a600f7fdb1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm and a callback phishing lure, suggesting an attempt to trick the user into contacting a malicious actor. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://hanomanberjaya.com/contents/files/kazidazinixuxafibomap.pdf In PDF document text
    • http://jhdljz.com/userfiles/file/1632339244.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/suxonesivatek.pdfIn PDF document text
    • https://mimpidia.com/contents/files/sevixelakolifarupeb.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/42456463838.pdfIn PDF document text
    • https://unaizahic.com/Files/files/likunodedadamajavelelol.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/tikimimamibuvikono.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/tasiximatirader.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/41253930652.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/66261990069.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149758f2fb2f---boxedifivopifarumiporakop.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/80405179889.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/36564552047.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/72843046001.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/26074639372.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/51501445517.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8729138f3a181bda1684307fe409ccfa/19507645455.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k8n5m6lghd3k09r10fie04f05d/fovizifafajub.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/60869459216.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/66909134556.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/memelomafatutobowawo.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/bijawanivibigakadibasu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/64313741303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=police+parking+enforcementPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 17316 bytes
SHA-256: 508adb5ee5793f13fe58c270d2568f0adcc6d6d25182867c46b27b463f372498
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10748 bytes
SHA-256: ff9f55cb10f52dece90f2b0230a4a98b202057be3275496fe909371761529db4
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1