Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8671d1750551aa…

MALICIOUS

PDF

83.8 KB Created: 2021-07-08 00:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea2e4dad8c4497acfd3a877ed01ac939 SHA-1: 99b97c806f4501f13fa9af922fc5b4caa19f45f7 SHA-256: dd8671d1750551aa0afa713ff2f9334d06c948ce71294ce91bec9f2b679dc98c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=how+to+not+shrink+cotton+clothes
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d983b6a2---nabajadeparej.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/jqq2an38fq21tu051dfin7a2a4/jokakivum.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/voridew.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/74302ca3f0b30476d7fee6261df3c2d5/42526469804.pdf
    • https://mumegram.com/userfiles/file/jatuvokafajulo.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0370b84a46---vulalevilizumuzenif.pdf
    • http://alibabashipping.com/userfiles/file/fumibanugatasuwuse.pdf
    • https://contabil-fiscal.ro/mm/file/81870850030.pdf
    • https://isabellepieman.com/userfiles/file/57424805877.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606efecf3e31c---27217081764.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826cfa7608d---wetabigobuviwenasuf.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/349ac75588aef45a8e29f332bfc5578f/tubumaxuzeku.pdf
    • http://bawaconstructions.com/editorData/file/41501611660.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/kadufuvizuxaxut.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/15piul2b24vk7u9n2rhodqjkbh/72960076737.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fa5bddfcd161b0b85408ce23cd70b8d7/86727516267.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/eba67338cbabb8a17e3ff9cff738622d/muzizulogofederixupelujaj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4cb27a03f---96411065644.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9ltqf5c8nb457m0nmqbs5fbl62/janafigidawukeju.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721ac7cf3db---pimoworoxixox.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/75e624573b2ce76e3c253b9216c8d631/49034151450.pdf
    • 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_off0000e7d3.bin
f82a3e2c01cb214570fa06e702811aadf3250d982dfc767a7a58b348ad09d901
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16612 bytes
font_01_sfnt_off000112c9.bin
14d8426c51e026ee671e6ca5c1e53786ca7c2a800b9e77eeb21e86584f9e569c
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 10332 bytes
font_02_sfnt_off00012a0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 16792 bytes