Malicious PDF — malware analysis report

Static analysis result for SHA-256 b866757b28e71d3c…

MALICIOUS

PDF

124.5 KB Created: 2021-06-13 11:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 73b6bb881e42a9fcfbbee76fba0ee810 SHA-1: d9fe91224f4e514b1c138fec5180096d28863ff9 SHA-256: b866757b28e71d3c10245ea98a60065fa170e46873fb84f8eeeb4f24d0db88ad
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=coding+arduino+uno PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef275e774---1298720872.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccafc9a1b---13769830597.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9kq6q48s5bsaui3aok072j4ve3/41442667502.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d6197644c---44652098854.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff8fbfa8a---gukaki.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/xofogubevutevuda.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9722c21b---35258402065.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3bfbc91a4d44d60965673b14d16b9110/tezodupereminamebuwatadav.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a586e960---vuxusakuri.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/fizadutapavevowuj.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13acceaa5---jirurinujam.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/62d6b038e9914e743ca497ae681142bf/91728467665.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/1011104850.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/35497469031.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/gotunivekigutut.pdfIn PDF document text
    • http://kalikraft.com/images/file/womolipuxupesixukibuwal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001786c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1786C 10868 bytes
SHA-256: 9cabaf31f4661ebfea270280ee650f2ed1f714f90dc880a8d3b63247f3f2e0f5
font_01_sfnt_off00019b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B25 4688 bytes
SHA-256: ef3632f3ee47a9d63f727ed1fb23fb8fa04d13deac9ae40cfa7dc33794f45be3
font_02_sfnt_off0001ab25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB25 23312 bytes
SHA-256: 5ac09abebc9192c6a782bcc5fe4dbc140aafd9041f749133231ea1cca4837a92