Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43264d72e9a6e69…

MALICIOUS

PDF

87.6 KB Created: 2021-08-14 16:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c80dffd44fe26f60fa7d784c7eca2dd7 SHA-1: fa1fd0c6cecc0bd7cb0ac744972622243d620419 SHA-256: e43264d72e9a6e69a5e449f6fb0c2d00fed25d80fb3ef06107131b139ef612b6
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or acting as link farms on disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with malicious links or potentially calling fraudulent numbers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=tuck+everlasting+novel+pdf PDF link annotation
    • http://pttaccounting.com/userfiles/files/28520590532.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/63421976257.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/wajezalunavuja.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/22076303234.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/c187iguj9na1a54a47gq7enu2m/67068556949.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/6uipi1p76so81e4a4mb7098qh1/sakezixa.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zafozepa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae34329c2---66989846326.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/safurajogukapusib.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/rukuxatorut.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/70637859916.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/bedawaxerafunima.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/relazotifuleva.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/xakoxuwe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7691mu4sb80oc6m9hvjbombnne/34404617666.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0f16085f---gogiwupikazituwikuzuxen.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/54721830398.pdfIn PDF document text
    • https://777mto.com/contents//files/93618533269.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11c0431b8---27967641128.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b663dece1---tekolebororegibe.pdfIn PDF document text
    • https://melz-feu.ru/upload/forajujig.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/66055239673.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c535f8d68f5---natabilunimazokuri.pdfIn PDF document text
    • http://yoron.net/up/files/mopugedutiwusefe.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/gijavutupoge.pdfIn PDF document text
    • 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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 11016 bytes
SHA-256: 74902fd84d67407c840ab8abbf39fb576a3fe9e6e15a222dff08bacfd4841d35
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 17820 bytes
SHA-256: afe43be580676c0f9523c842f445d5e548f950e5d6def134dbdaef00ce186494

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