Malicious PDF — malware analysis report

Static analysis result for SHA-256 af61677f2a38cee1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 15:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b9e8168fb3304344ae786e635029354 SHA-1: 102c0e611fbeeb0f6c0634cc99b3bc387a518b0f SHA-256: af61677f2a38cee101c6862e3623a4be9c3b140c5bc6dba15405fadce33745fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=android+data+recovery+near+me
    • http://sportschoolindex.nl/images/uploads/4004479131.pdf
    • http://automozg.by/upload/editor/files/5394317640.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614010dacf3c1---malorojolewijurufusimikuj.pdf
    • https://dongcohonda.com/userfiles/file/44949014638.pdf
    • http://ingmarcofaedi.com/userfiles/files/19901261154.pdf
    • https://kalashad.com/userfiles/file/62510383466.pdf
    • http://maybaobidinhdinh.com/upload/files/javifoziwaju.pdf
    • http://www.leasebridge.com/CKUPimg/files/ragosejukoluzata.pdf
    • https://ptogel2.com/contents/files/69742183326.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rvksgujrbi1qb1iukj93l9kpiv/28539877019.pdf
    • https://ataru.site/js/ckfinder/userfiles/files/2331096084.pdf
    • https://firesystem.ro/imagini_ws/7945274885.pdf
    • http://jiangsutravel.kr/userfiles/files/20210918_060915.pdf
    • http://robalton.es/Albums/images/file///35815285180.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/60221267305.pdf
    • http://rasciindia.com/firetech/ckupload/files/fupetedageladotolujared.pdf
    • https://vnsteeldetailing.com/UserFiles/files/76090045202.pdf
    • https://candica.pl/ckfinder/userfiles/files/govifimubunega.pdf
    • https://ph789.com/pinhsuan/files/file/lotavamazurojifom.pdf
    • https://kanat.com/upload/ckfinder/files/zarunew.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/37247909787.pdf
    • http://neoclassicalmansions.com/uplds/file/tabojexejuzoxebojofigoka.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d9d6cf038---bogipok.pdf
    • http://xaydungphongphu.com/uploads/files/24866545098.pdf
    • https://palezieux.com/ckfinder/userfiles/files/74245855804.pdf
    • http://marcth.pl/media/fck/file/poxojalasuzozifuxiru.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_off0000b588.bin
e790d248432c22255c67cfec8141baea6706e0b235973c53dabd32dce6c0a7cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 10476 bytes
font_01_sfnt_off0000cd52.bin
70f3b7db97dcee01728a429d5fd933250916cd6ed89140bd0a1bd77339edd5bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 16452 bytes
font_02_sfnt_off0000f716.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 16792 bytes