Malicious PDF — malware analysis report

Static analysis result for SHA-256 b124993dfd7b989f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 02:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3028274598c9ec9905ef42e9775e637 SHA-1: 0cb28dd2bf71e732db179ab82d41be5fdf47d3cc SHA-256: b124993dfd7b989fa1b0361b860addeff7503b64e95d90631904a7e9ad2ba9ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the presence of numerous external links and the 'link farm' heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa675c5c1c---joritonododaritagexesazoj.pdf In PDF document text
    • https://riminabda.sk/userfiles/file/fonaxota.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/daxuwigakul.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/64572509273.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/26357841300.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/01bd7e97f7f53c8edd03dab03d885746/55732900791.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/15718076795.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/tomokafanawofa.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/80542408121.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/butesimonamevir.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/13524668165.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/zulujimonorolid.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/60883859033.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/63917478679.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/nijijositemunagutoviliwux.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddfcda170---82240098744.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/11398159057.pdfIn PDF document text
    • http://kachelofen-prommegger.at/kesivaxubiluj.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f91466481628ed9f99b58d9ee101edbf/gozaredarixok.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/negijibafipifiko.pdfIn PDF document text
    • http://saaretravel.ee/images/file/87722131617.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/52842301160.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_043027.pdfIn PDF document text
    • https://tdfstore.it/file/lukewatub.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/63409714225.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea7daf7e32cae0e56652d11e1ea1bb14/99209469820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mobile+print+to+pdfPDF 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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 10296 bytes
SHA-256: 9d0ac4a283909e25ec20da1efc4f9022ce55449d520f30f8d35b5e66a86107b7
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 18300 bytes
SHA-256: dbf1dcfd7217d5ea12a12ff880326b739ab18678eabae7f0525fd00acda359aa
font_02_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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