Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec530b03055cb2a7…

MALICIOUS

PDF

73.8 KB Created: 2021-07-03 22:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a0db4980ebb0d059c7e334af42f18b7 SHA-1: fa30ca012be19406af445dd755288624e3bcff70 SHA-256: ec530b03055cb2a7d017dd8ddd951faf17ef2a86bb60ab1b284a5a2e827e18ff
176 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous links to external PDFs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of a link farm and disposable hosting further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d29771cdb6aeab4b0abdcd6efc1204a8/gorupe.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/46286230867.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f768ac9b9b212bbc17d7017873fb4824/83808267927.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/59143016686.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5jmrk0b3gvmmoh9nhmpn8j5235/62227014250.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ae709568---35777425394.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/026c131db0ba620e13bb41ecb0b0239d/salilefefanavagaxelu.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8g39jnh14djb8lms00r54s9ast/37435022379.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/simuxorazupav.pdf
    • http://cmtdental.com/upload/ckimg/files/11865371216.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e15c16e7d716e25614c2ade7bb87c30f/nuwogodapimuxatedebobo.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/25deb3f08fd8f47b8b33396b1901eb0f/mevidolofizabirinizas.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/jugavuxafadixeg.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11612cbb3c---ratavipuwerudonukepegef.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e398d8de---manawom.pdf
    • https://aynadakikemalizm.com/resimler/files/mumugoju.pdf
    • https://liniagdanskzydowo.pl/files/42742257331.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/f945c72e2a693de155225b34ffba5a6f/46178051238.pdf
    • http://hesexpo.com/img/editor/image/file/62476829668.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/42fd7da0d97a40818fe0333e1ab1f716/82555646100.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabb4a3a6d---41656715271.pdf
    • http://brenna-ski.pl/userfiles/file/xunavoboturatiwemuwexefiw.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d5c8ce51d---35310476784.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s8k1o2tst1h1njp2qp3hq3pu4q/rutewizoluzezaguna.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=all+about+me+teacher+powerpoint
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c080.bin
fcab2ea1b695916808dc2f1fb5a0a31d3b53f897e62730f2a559f41683824607
pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 15924 bytes
font_01_sfnt_off0000e95e.bin
613bd066996ccfb813f912bb4ad7b4d283553517feb111c658822160bd9e27df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 10780 bytes
font_02_sfnt_off000101d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 16792 bytes