Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b34ac824fb8e94…

MALICIOUS

PDF

75.9 KB Created: 2021-06-18 02:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d798d03f303391e5eaf7880d59128a09 SHA-1: 4cedbbfe7f8c0e23a401f7a15e90fbe1b8b117ef SHA-256: 43b34ac824fb8e9482b321609bd33d23fadceb8adf31eb744ee8066524e1fe71
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to distribute further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to download a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=hd+wallpapers+1080p+zip+file+download PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861ca20632e---27353390729.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f2c7f2aa36c695e05eaea7cdb640aae/3296016279.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3267da05082c250c4a7a72b55a618e59/70910021751.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160775db35da32---80231719759.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16093d9694a51d---filuxe.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/74c7607e5acbbd54324223c573dcd871/sibopetogutugozavos.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/34221290923.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8ae11d324---gefavotina.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/98288717590.pdfIn PDF document text
    • http://intergeored.com/upload/File/degonutexamuwolu.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/zafuwelebalojumuvug.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e147d57a2---takexiz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e0238ca2f---kipiridabunegufimezitop.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/s17llt7ef8j8i2e0otvmadv4lo/18006667303.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/48422225289.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072a34f9c545---vojikofisubukifepifapa.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a45e3ff9e---36265614222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 5232 bytes
SHA-256: 218519c0508e30b799369997f67cea48d4b5d474822472ff8043124f13b0cf5b
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 10532 bytes
SHA-256: 2ac24f6808c69c8e3f5eb9e0d0813db4b4fce4fecbb71eaff3a6745cca09e7d1
font_02_sfnt_off00011494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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