Malicious PDF — malware analysis report

Static analysis result for SHA-256 501499c14d8d340d…

MALICIOUS

PDF

89.9 KB Created: 2021-09-17 22:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dadaa224d328892e3e2a3b96000de45 SHA-1: 7d2ce5e06535e2252877820faf8f522966132d00 SHA-256: 501499c14d8d340def9320a7ca1fdb95f00314077a2aa1b38a6f053b14c1590d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various download sites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pixomot.ru/uplcv?utm_term=download+mcpe+master+minecraft+pocket+edition
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea5f1f6ee---tegugelusape.pdf
    • https://sluganarodu.org/userfiles/files/32873209999.pdf
    • http://childconnect.com/swi/fckfiles/file/53235817239.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/57701912851.pdf
    • https://digireg.it/upload/butofevedivu.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/zidoredepikazufut.pdf
    • https://premium-house.uz/images/file/29378898621.pdf
    • https://nangluongvada.com/uploads/files/12117331216.pdf
    • http://scales-center.com/shop/fck_file/file/famekabedafalob.pdf
    • http://dancephoto.ru/userfiles/files/56799109753.pdf
    • http://ingegnasrl.com/userfiles/files/wovetuvisokanatobiwufiz.pdf
    • http://ingegnasrl.com/userfiles/files/mokawew.pdf
    • https://rajatotogroup1.com/contents/files/nobomibagexiwewirisobuli.pdf
    • http://namngonviet.vn/user-/files/46397233526.pdf
    • http://starfishdowney.com/uploads/files/xobexivuxatotixiden.pdf
    • https://olivermilk.vn/tctt/sites/aaa/file/texava.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/67215181155.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210907133140.pdf
    • http://studiopignotti.it/userfiles/files/34966867793.pdf
    • http://zentrumok.com/userfile/files/rididazifesegokomidij.pdf
    • http://umartravel.com/files/ditubufabivik.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5c30c792efa09b82aebb719ea35bd6c6/6182505039.pdf
    • http://techcessgroups.com/userfiles/file/kigegezimagefubofukaxef.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fbf10ffa46cb6289b08116133b859a71/78183933412.pdf
    • http://astmasme.com/userData/board/file/46778421815.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_off0000f764.bin
04b3d3ce5fff6d6ff212b5b05e903cea1eebcc8f5be4465e2f3a8182a11c6332
pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 18920 bytes
font_01_sfnt_off0001286d.bin
162b97d407b10f60bb4e3b5f924a3ede8e17b1d250954352aa4b2ae97d1f8479
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 10960 bytes
font_02_sfnt_off000141e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E3 16792 bytes