Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c75db2486b17b1…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 18:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aad2e3f4362582a907f62abac32491df SHA-1: 90ab5f6fe9464e6cb1ac155a65dd1ff46870cd7f SHA-256: 06c75db2486b17b10c5d856b7583994382994e39cdfd38091a54c06d28658452
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent. No scripts were extracted, but the structure strongly implies the document's purpose is to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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://gregor-biffiger.ch/userfiles/file/93629878234.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a38f58d34---rujefuresuzajesewugu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d22ed00cfaf58090b12b40de69067689/35045056063.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/69e45546a5099320b528f19a1ff48fa0/nuruwejotuxadubegu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160887e0281303---woseguv.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a125d3e1---62181770901.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6165c4c7---22452359878.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70408e7c01---niluzizasokezerizin.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/4lilc6dbu2nvotc0o1k1970a6m/65098709456.pdfIn PDF document text
    • http://aimic.com/userfiles/file/delufokenu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/gimivojakexizu.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/ruzimamuxupunejexeguzo.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fodadimakunadero.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9d14d4a6---7967174286.pdfIn PDF document text
    • https://senhewood.com/d/files/wawabi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb52f14ce---73252106750.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804ac72c5ba---pivazizet.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/baragokeretanenovomaboro.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nikixaxi.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210510162938.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/urop2n2ugcd7vcsv36cstqk3q8/dexomifululomevus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbd11adeba---48890748899.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/lamixikubajakomo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a3cd3920---wukagegowakosazilulo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4acfec7693---fozidodozemodaw.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f840f9e2ff231e2840d3a35dfded9436/60210748548.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/varn5v9nqhnomaeuc8d92k9cu1/sibixawepamado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+can+you+make+name+tagsPDF 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_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 17492 bytes
SHA-256: 40359bf93d7b0280086411598c0041f2a5129ccd64d860a00be24e8c57e78343
font_01_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 10932 bytes
SHA-256: 563091e77b9cae752f4e1b187a51e7253746126f7a1ee884c23c452c3448154c
font_02_sfnt_off00014bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1