Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e63af3707b50eb4…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 10:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16096d28f4c912c2af68785a68b594eb SHA-1: af6af3d4f0e79adaea93e3ddffef2c4f982c794b SHA-256: 7e63af3707b50eb493025e55dd4134a0623230cca81c59b8b99c7783f6d4babb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.siposferenc.hu/html/92085333628.pdf
    • http://notar-frings.de/userfiles/file/mibudosisiwumozeke.pdf
    • http://campbellelectronics.com/uploads/supexoralotixexikozojekaj.pdf
    • http://jcnjl.com/userfiles/files/diguzixabilovim.pdf
    • https://kermanrooz.com/img/files/lugetokili.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tefabema.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/64734527336.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/fotos.pdf
    • http://carszana.com/image/upload/File/44677444559.pdf
    • http://dogomanhnghia.com/uploads/files/94275937274.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/pavimapobawosefivawikili.pdf
    • https://verredistri.fr/xmedia/file/safize.pdf
    • http://www.jokilaaksonratsastajat.fi/file/livojuzabebexebivafuxuwi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fac849c90---xawanozol.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hpo9va29arfnf44khtvmr13ktv/xobukaxiwugizupijuba.pdf
    • http://dmhu.eu/uploads/uplib/file/fegazuje.pdf
    • http://robfredo.com/userfiles/file/33180090005.pdf
    • http://hypotekaprezamestnancov.sk/res/file/32715011956.pdf
    • http://uforoi.com/app/webroot/uploads/files/gasuwowowexanudipiga.pdf
    • http://getrade.net/uploadfiles/file/12712369248.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/2t23f87vlth9i7fmp8lk5ba825/wagetaj.pdf
    • https://zahrek.com/userfiles/file/sexududipev.pdf
    • http://ok-poland.com/userfiles/file/79538696752.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ping+master+x+apk
    • 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_off0000b787.bin
fdb446c6ef6de3cefa696d3b06aa037e7da5d9843482a764da0cca94ce27ef3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB787 10624 bytes
font_01_sfnt_off0000cfd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 16792 bytes
font_02_sfnt_off0000e7ea.bin
e2c9cbcdba5c9ef976a30126d3f965471e2369c981a566caa1231ab7580b27cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 19368 bytes

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