Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b8830299ef74e7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-01 05:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dca8625025ecc4fbe2c4a54251745f2 SHA-1: 386afd70feb9d1b341f7e356b1b5784f1d8d16fa SHA-256: a4b8830299ef74e7d5b0691ac53b0afd56b60a8e5a46429ff743888302045a82
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pistant.ru/uplcv?utm_term=food+for+weight+loss+veg PDF link annotation
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/6673451e276c78db5b57a6d13da1ed0e/pewowipeduj.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8fm3keg36fptsmuvh94ihue6s6/mijubozufanapigiwolewi.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/nerarixogafedarukokexog.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/zubij.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/tegesuwokaf.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2a23e9789b18eb3cf20949c6db07617d/26926174211.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075f23a2d4fb---kilodefitexaraxafewexe.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tafujerajonasogiwedidel.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vj5k3ibosv9k5nij58daglpp8c/66795639134.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0bab76cb6f430784baa391232dd2bfe6/83691077706.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fc2aa446---21231436852.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4ntlhpqdvd6u5pfcb8uhhjl81/67383896660.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/19650719948.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9240d7004b746d456f6be6d2e17ce632/75522468572.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/11291614088.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/xagaxuva.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607230d73d4e6---wusurizonele.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/59944581019.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/demakesubok.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bhs02quceehthkastvbt0klv15/22980184420.pdfIn PDF document text
    • https://tsegypt.com/file/18905705704.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/63850859804.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ntlobi0tv1mcjnauho4ve9h1e5/lakelarob.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/wutob.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831659d5922---fapemirujojezefi.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/17875322785.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/73279381107.pdfIn 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://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_off0000b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB894 15148 bytes
SHA-256: 2dd8d65a074b5b89aef34f495ccb27d2d836b035c788cbfc958bb7d2a3e988b3
font_01_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10496 bytes
SHA-256: 508c50e90e582ceabaaff6e8014a529fdefc2e2c496b264cc20742648df6e58f