Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236e60b90df0e84…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 12:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 686de7163f021d8e4a806d1223f61400 SHA-1: 1cb3d0ae8da9f7bd31bb2a28ea8836deb35ca9cd SHA-256: 1236e60b90df0e84b50681e92a7da2901c431b81f8e55a6d63fc9779428734bb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://nomylo.ru/uplcv?utm_term=hays+county+inmate+search PDF link annotation
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/81769106385.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606f333f09175---walekaxagalinagokopapod.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/revuma.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/10d44689250852216ad8f4afc232c732/65914128887.pdfIn PDF document text
    • http://hnspkjx.com/d/files/xoxazedosutarimogaxuter.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/16258326205.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/jisipisaxediwoxik.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87acdf73261b19b48b3ac813c9bb7d87/193015730.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/91718037673.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eutmoq9cf4ceniphra2512k1r1/pokidozenozivatununuw.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gnt937clqdscbm226berc2lq0n/77773796096.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/foniwujasugo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8052195e7---mugubufuzidapizileranuzi.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/44234867607.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/04fa65876a4e71394d7460cabe1ff20c/70264381231.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608f586c5df2b---96597212343.pdfPDF link annotation
    • https://pima-alarms.net/slicice/file/kezimogamosejugijesilewed.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3446253812.pdfIn PDF document text
    • https://doitoutdoorz.com/file/RZbYSpVHp75niGqY.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d23dc246---91440283339.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4588facdd6---32962968898.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/supoteporonaduj.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dimekelefologasetupudevug.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/tugojumenubelanutuvu.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/93196041089.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 10656 bytes
SHA-256: 6c0fb375362ed0fc9c12e11b1eaeabd452096749a77e660eb10e404dcc388372
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 18284 bytes
SHA-256: a6526e835bc94dbcd04dfce9954bc3d0f6102c2263e0c27dabe2df8a1db6bf96

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