Malicious PDF — malware analysis report

Static analysis result for SHA-256 09441d7fa01eec99…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 08:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d76c914f21aeb9b5a928520cad3ffc4 SHA-1: e7e526a59d11866103f5f9ffd6bb6a9bfab11ce8 SHA-256: 09441d7fa01eec998693d9faa6d9bf2164e88d269c746f17f2cd8fcb14fe36a1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=download+play+store+to+android+phone
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/20db047f1bef81c9ccf9e534c85c7bc9/74800328730.pdf
    • http://mobilenmr.com/files/files/xosegexuxagaxilerudediz.pdf
    • http://sake-tori.com/images/library/File/wemixabixetizaxew.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/89175206805.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bbcdd816---mozuwakiwepujup.pdf
    • http://www.serge-valentin.net/ckfinder/userfiles/files/20982039671.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/47988883473.pdf
    • http://bmfjhjk.friend-match.com/upload/files/54872610064.pdf
    • https://sunridgecorp.com/uploads/files/202109040509184474.pdf
    • http://vo23.ru/upload/file/38571523901.pdf
    • https://webornate.com/viking1/uploads/files/wilulazoxerogonagele.pdf
    • http://linuxnewyork.com/draft/media/33537677744.pdf
    • http://artecgroupservices.com/imagenes/file/35625053725.pdf
    • http://dragonspond.com/uploads/files/supawuxaxinoraberowoduko.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/takadozadotirigitiz.pdf
    • http://rococosofa.com/files/files/bowebujomeza.pdf
    • http://ankurgroups.com/userfiles/file/zibilirukexobizenojak.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0adf2c8ebcd870128c5f271fd6d572c/20405659470.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/65681597498.pdf
    • https://foodexgida.com/uploads/files/penujuleja.pdf
    • https://mongolia-volkslift.com/uploads/files/1091401358.pdf
    • https://rivieresoceanie.com/ckfinder/userfiles/files/90794269660.pdf
    • http://botosani.ro/img/uploads/file/wulajasaxu.pdf
    • http://vsrru.ru/userfiles/file/51707868673.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_off0000b9c9.bin
5b8ea94f0e897447c3fa44be35baa27319fd15f4326b03e4583625d161917003
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C9 15908 bytes
font_01_sfnt_off0000e294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 16792 bytes
font_02_sfnt_off0000faab.bin
0ac12c0eca13fdbc117af0fe9ef44dbae3b1535dd33ed1bf4953be54e7333c57
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10688 bytes