Malicious PDF — malware analysis report

Static analysis result for SHA-256 9817eb38ac5278f0…

MALICIOUS

PDF

93.0 KB Created: 2021-06-27 03:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49ff28a31e875817d90028bbbedb49da SHA-1: 4d84f2c6eb8e28198023174bb45e799d0e4fa53f SHA-256: 9817eb38ac5278f068eae8502e8bc71b13c37841787bdceb59a7bd27a91754d1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/068797dc8195b1a87856c273ba010e02/fusiwevilinadusubezigezo.pdf
    • http://sotel-perm.ru/site/file/90688272673.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/37970630104.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f59c4ac0---nigarakonuneduleb.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082597ae06f2---43746366003.pdf
    • http://gorisum.net/fckeditor/upload_file/file/pagovekofeguxiji.pdf
    • https://tavio.ru/files/file/20308479345.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a883b119112079e67a8fc2694a5b6957/58234332586.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c168c7b50---60520471658.pdf
    • http://hzzxtl.com/UploadFile/file/20210627063250006.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/wutojozozopunivarebiginex.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0787af301---64181525016.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792f38097d5---zutawilamisukuvazipezelos.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7s1kh6dlkcr3gc2jnavcp4mm5k/50573269584.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/249081471.pdf
    • https://termoformat.md/img/files/talifup.pdf
    • http://skrabl.pl/www/rpbd/fck/file/11729228941.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6264a9e3d---pawek.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/0e9d22b6df7f7d8d4ab0335fb49688fa/rajotil.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723b908ce23---xomikaxinugidi.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d052c03a50e---rolulatejoparuxe.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/d4la12je3e6nfi0l90t6l51rp9/murosifufamano.pdf
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/18452352943.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813b05f148c---papedaludigofosipigufadir.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fc5dbb0a4b0e690c65ba4efd296708c7/vuzorodojimunepa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=it+abbreviation+meaning
    • 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_off0001046e.bin
494135defa51a31a000c247211c56fd41ecd83c61ecb460ec788b7be5f37b79a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 10396 bytes
font_01_sfnt_off00011bf4.bin
62e54bd0d9405ec63307cfe71038e6536b7d6ffca1a83e0a28bf7245c6a5037e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 18796 bytes
font_02_sfnt_off00014d3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3B 16792 bytes