PDF malware analysis — malicious · 0da1a41b0be6a559

MALICIOUS

PDF

86.9 KB Created: 2021-07-04 02:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: fc1a0709cc3638e9df5b14bc2e5701cf SHA-1: ff8985f57abce8da0ed30d7722dc1539f7a2229d SHA-256: 0da1a41b0be6a5590ce65ce0180ed7996a6fb2b3b9ff02c4389b25e725614a7f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on various domains, many of which appear to be compromised WordPress sites. The primary function of this PDF is to redirect users to these external sites, likely for phishing or to serve a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://oniceh.ru/uplcv?utm_term=as+might+be+expected PDF link annotation
- http://3e-recycling.ru/app/webroot/filesfiles/61192420139.pdfIn PDF document text
- http://clingac.com/d/files/xuganufoduwas.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f62b4a4f0---rexewedunobo.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4c436bd41fccff046c61475923c45c42/puvegelopenapapo.pdfIn PDF document text
- https://wotfiles.com/ckfinder/userfiles/files/xumotanugigoror.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9381ce152c163835771cc637e1ca0d46/leresulativ.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59c82dc93---vusopudebugifaziwagup.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe841ed813---zinilatezojivud.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6a324b0c---92463324635.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28608334a0---16279996427.pdfIn PDF document text
- https://daaeportrett.no/upload/file/gitegitepemixuxi.pdfIn PDF document text
- https://luminex.pl/upload/file/8779728686.pdfIn PDF document text
- https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/g45kcrfpol85vd4bcdh5640vbn/44029170500.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607115d47c8ec---tazukobepaxo.pdfIn PDF document text
- http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/571e7960de0fdaecce60425a371f920f/66757884852.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/p3pv86dd2j4l78bqg4cmnuding/pesanamifutitapenirines.pdfIn PDF document text
- https://cuisinescartier.ca/upload/editor/file/dusagosapezabaxawopakuvin.pdfIn PDF document text
- https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hhqo6t92e9la0lmjuifg20b0eo/70133510306.pdfIn PDF document text
- http://99hospitalitygroup.com/ckfinder/userfiles/files/vipanitup.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4e62b483---3997769436.pdfIn PDF document text
- http://www.yoko-ono.be/images/userfiles/file/57754221253.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/71b02d80645ec76faae5b86e2bc40508/pidiwivojip.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0e826d017140bbba07417f3eb36304e3/4795675602.pdfIn PDF document text
- https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8ce44a6075d8fb1f9dbb4cd08f83b466/28220829018.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF6E	17772 bytes
SHA-256: `9147a82030e37433367505917af3701d321b261ddc47ec41836b5258db52d7e0`
`font_01_sfnt_off00011cee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CEE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013505.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13505	10652 bytes
SHA-256: `f6d0c9f7da229e0372a126c9a5c77dcf54fdb5eabcb73d1511c94f6f6e804ab1`

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