Malicious PDF — malware analysis report

Static analysis result for SHA-256 276f5849fd53fc72…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 09:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 401124288ed8a70237511c2878d9f52d SHA-1: 5667298bb880ac5e1fcb5059a54fad6497fcc271 SHA-256: 276f5849fd53fc725d497f0dd892a05d8d040ea799c18f1ba26613423c13cc10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=master+of+science+with+honors PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4a9813b785ef1e17e4f772fe72a3da9f/93407248208.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/54637548560.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gopofarewidalexa.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/jdmmj26b2n5hj6opiaehfqrihu/68996767034.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072030ae298f---72471919782.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/tumivebimami.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/27407405137.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///88890542297.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/97033065794.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/p9ah9d4a1q8fguciobn5ckrb85/marufozanasipa.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b0d9be3b1e7f06a8bd2a05fab12c9dee/nituxagibamudinevuje.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/najulosuratinifosaduwagor.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/8427913711.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/65951350577.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/pagovukebirapijisizor.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/75430931282.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/87620638731.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f323318ad3---datuzajevude.pdfIn PDF document text
    • https://samtee.com/admin/images/file/xonedaxixelukikumapopenim.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608378359a6d6---76553754153.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/xorokareroviweku.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c395447a9---buxukuwidikezabajod.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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 10464 bytes
SHA-256: 0aba89470d20fa0d3406d17070965b223fc7cf5dbd66f1acb9fb55aca1276893
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 17500 bytes
SHA-256: 1fe3bfe8b0216ec73aefa512a38b2c766fa919ea2923a5505695a87b735fa2ca