Malicious PDF — malware analysis report

Static analysis result for SHA-256 a669bc5c6661a4f6…

MALICIOUS

PDF

82.3 KB Created: 2021-06-26 21:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5774a8ad61dbcf14c5e29d2598e1201 SHA-1: 70fb24e9bb24f3d5b05bf608b325223709b6342c SHA-256: a669bc5c6661a4f6ec39ec154d039d639b96e80a8d453affec9586de5c83a33c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=pdf+to+word+doc+converter+free
    • https://alate.org/admin/fckeditor/editorfile/lunuzovalikebow.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d562e42052e---katakaguwu.pdf
    • http://sb-78.ru/files/file/62899729598.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hsp27t85h94vopkda50t9nh9r4/6987706204.pdf
    • http://mazdooradda.com/userfiles/file/zajunebudo.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/7fe2dc4f68844ee5323e4cb11ab702b0/68326480229.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c25925ab---fukuwalupifase.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/44640726521.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c846aa2341e039c72ae18029d2e9f7ad/xelepefujasutanunibiwo.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7420f4e4620548fa59b884dec9aa4158/fiseluloveterafenu.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/afvsb52gaii8p8noh2np400f6i/fufopigegibu.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/628736b3b411481f9a5bd951049eff38/92425378411.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/81e3b3789cd03d505fd9dbdbbda37706/zedutajavadorug.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2936061a---43322050695.pdf
    • http://stalmost.pl/userfiles/file/megedu.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/29pd6027hn53cdigse34v9t78d/13811082498.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1m40stuleaul910gf6leb5b1a6/gufofiwumel.pdf
    • http://dolphinkorea.com/files/files/gajuxixo.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d290572e8---nizelugabuwisezad.pdf
    • http://playeasypiano.com/resources/fck_images/27051181497.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beeb2b76ab---91323134782.pdf
    • https://brianhigbielaw.com/UserFiles/file/vaweju.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/5btec5pfn0pqrhn8tjfanfkkkj/refijebibukimadabaxaj.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607693b06ac59---42285092652.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_off0000df7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 16792 bytes
font_01_sfnt_off0000f78c.bin
cae46c7270b32811f01bf3a2b8988b70ad1e7bfcb5995c239c069ad9cc6d3a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 17392 bytes
font_02_sfnt_off00012546.bin
ddaa40ea275b96377f026384fff091990414a64a6184288b1efc5a2f771c0f9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 10152 bytes

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