Malicious PDF — malware analysis report

Static analysis result for SHA-256 21282fd9165b9aa2…

MALICIOUS

PDF

61.1 KB Created: 2021-06-18 22:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 69c77c839fdfa35a7d31d56b2d2bfcc9 SHA-1: 895942e8415b1eb794a6fac16e785f2e40bd9365 SHA-256: 21282fd9165b9aa2054ab5b6e5c25e8cab93aa0765602776cfbf60c2e78cc7e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/uplcv?utm_term=brain+droppings+george+carlin+pdf PDF link annotation
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cd0a2402---29024092627.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3ca13b5c9ac5726b4f4fe048308e100d/59334971404.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file/%5C/ruwegiladodiremezumuxotog.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68079a128---rujigapuzixadusukusime.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/badipodevutepobaliri.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3bca7f0ddd7883e6fb29f53afdf1f783/zekemojawotubotowenomew.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7387daf19---63850844854.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740cd1062e3---25242531986.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/892e91a6e508e180730f974503944769/mitiletelexebofe.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/rojudobovegib.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/11156123312.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c414de8a7eb---xenegilanetuxijuv.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ab1d814a---rojupotiwusevekefugavemi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0164adeb4---64042578797.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/56938671409.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8290f4f3a5850cccb502659b1c213817/jevusiwuzip.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/55106866854.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b0b21fb0e15b15e20b839fea86199101/92380371693.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d641a380---41519279972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 5372 bytes
SHA-256: b541bea68ba387b5cfccdcd7d14050e793ac8988208eaa75c46f5ee800085fb9
font_01_sfnt_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 9884 bytes
SHA-256: eb6c09552a71cb54f674b816bbc93d0194a4c928197b525a0be05dbc7a3c1859

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