Malicious PDF — malware analysis report

Static analysis result for SHA-256 f294ab0464d0a1db…

MALICIOUS

PDF

97.3 KB Created: 2021-09-04 09:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a87ed137497a0482a5549d2a190ab91a SHA-1: 111b2ebdf26f5b8fdbacaf572a67e011d42f5d88 SHA-256: f294ab0464d0a1db59d605f3a2bf92a9b2c0a935576c35a2736dfc33ce4ad097
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites using the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082acedad9b1---fowagaziwofujejiguzeg.pdf In PDF document text
    • http://mixmarketing.vn/upload/fck/file/97535581420.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd07c9ae51---xirutoduledopex.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/69031747488.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc2a3b08d---motasivodofegig.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003caf8dd---82530350678.pdfIn PDF document text
    • https://digireg.es/upload/zisurikoladeviwifafalix.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd18aca5a8---49329662442.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/50904974465.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-2/20210702145420104497.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210530014711154.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f408924aec---9594619373.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/vuwur.pdfIn PDF document text
    • http://ruresept.ru/files/file/30236309652.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b361d7520bf---32846341611.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/tiwafetaluxalipolus.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610523094c4d1---sizovudukiwev.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5e8707906c023d706371842ec4e60e6/gumejujurum.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/fevizalipatugirefazofizo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210776b60b---76525911947.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c00c2cc6a44ac20ce23c45811bab8439/komirutojugelowire.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/poliwijukexivomumoliso.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/70a7d01073719de8ae4358aeefffd9c5/81138724945.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/84627238636.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021081319004170554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=water+quality+management+in+south+africa+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001139a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 18988 bytes
SHA-256: d8a6d4402f7395ac7ea2556ea8ecebf852b12221cfd88f7a2085578656f70e6a
font_01_sfnt_off000144a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB7 11420 bytes
SHA-256: 47136a0925828944042e7a4b926f676d053e170c95289861cc7b2f83f9ccfdf2