Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8065afe46d2893b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-08 08:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ba1b2955ca91b0b3f734ad42151c0f1 SHA-1: ff183cabb1832b29f4d4f7672bc2ad935c345462 SHA-256: c8065afe46d2893b7bdebccf2c51c84b2d208501dd03e9884bf63a20031ba636
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://shengnabei.com/uploadfile/file///2021060915035732.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8eaf5d039---luwogitodeboliresosa.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d770a4a7da---81104766859.pdf
    • http://nuestratierrapremios.com/campannas/file/wawukomutamavenoraruropil.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/61314098905.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8b863e4434a9d01bd75a8045cfee4e7a/rotimawajonekebugom.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e6f166afa---8498622909.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/de94956f449d8200c3fe5f631b55c8b3/39349559633.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160746a7072d55---bubupodosorekilagofuz.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a576eb77a15---34692776020.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609acade47915---xezok.pdf
    • http://anjilh.com/uploadfile/file///2021042917444419.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/zukeno.pdf
    • http://www.allatpatikapecs.hu/images/file/37700749722.pdf
    • http://asfalon.com/__files/file/75757831370.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160924b31e9dcb---67464474639.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/122012811eef72eaf668ea7bdc8092bf/65497045026.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5369bb3424---24890394590.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/oms3t2v8ln972io1v6s2odkn15/fosiwubetajuvosuk.pdf
    • http://cheumst.com/upload/fckeditor/file/busuvigafoliku.pdf
    • http://ankurgroups.com/userfiles/file/85658153229.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/d8d8efdca1edb8fddf06d6b05d756a39/zosetuvuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=is+sodium+hydroxide+endothermic+or+exothermic
    • 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_off0000e882.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16792 bytes
font_01_sfnt_off00010099.bin
8d89d53d5635148f63a2a6c99b80ac32fd18dc70c41e929ba72021317327a916
pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10692 bytes
font_02_sfnt_off000118fe.bin
e93ce5424f796886f9f0679acfb58e5ea672c15390b99675b1fcc66f1e792107
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 18316 bytes