Malicious PDF — malware analysis report

Static analysis result for SHA-256 6950bbf736eae74f…

MALICIOUS

PDF

79.6 KB Created: 2021-06-23 03:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e12cdf3b7ad6f2599d6cd063c365d46a SHA-1: 9e5df89601f47a9aa222dcec4825fe1fc423d2ea SHA-256: 6950bbf736eae74fd06b30b7758dc5b5496d78ed3eac36eab26e6c257a99edc8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised CMS sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be junk data, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28c909fec---95332066128.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/29246df1e92bcd68571d9c6eb472bbbc/delanoz.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/67339101513.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/qv7jro19e6n3fh1n6l1u6tduuu/vomesubawaleveboka.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c8e07a65---22114927626.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c307b8d4a---wopijodutebe.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac170702ac9---fabideruzakizelilesajere.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/mutomefosalojufixowef.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/146576e47knmclqc139n6ai72l/84922751999.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/84940791969.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/19727528386.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acab3262568---jafirevixapumib.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff3adbd7c1---5587326996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=panasonic+es8109+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5392 bytes
SHA-256: 0557282347d6d1a6720818bee3b845041d78abc9125f28a27ac33bbf33435d18
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 11148 bytes
SHA-256: 214e6f80fceacadcba169b1bd10826c70b505ce36eb601bb3d1eb73f0c5b43db

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