PDF malware analysis — malicious · c7fb73700f7e9b69

MALICIOUS

PDF

96.1 KB Created: 2021-07-07 15:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: e490bde788ec85a09a749c91362e177d SHA-1: a408987b007a544797f7284051a003c93b706e05 SHA-256: c7fb73700f7e9b691e09e6ce4b2a595c827550a6ebf0614ea00c8277b024e90c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a lure to phishing or malware download sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues, but the presence of external links and the detection verdict strongly suggest a malicious purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9768

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://nomylo.ru/uplcv?utm_term=common+factors+of+36+and+42 PDF link annotation
- http://valdhans.cz/userfiles/file/13238159282.pdfIn PDF document text
- https://gifarlcm.com/upfiles/editor/files/xokexubefaxaxonebovonasug.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a4711032---lijerepipupak.pdfIn PDF document text
- http://erex.hu/upload/file/tinegewadevudegekikus.pdfIn PDF document text
- http://applecentervn.com/uploads/image/files/samuti.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae50f24fb0---dilaxazuwunifojizu.pdfIn PDF document text
- http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e3127764552---robopegugejoxakubi.pdfIn PDF document text
- http://ukicda.com/admin/fckeditor_upfiles/file/2021061117575780554.pdfIn PDF document text
- http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36085594b1---2858955820.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f740fadbed8dfa4a9a5f69589ea38d44/vaperuxejinari.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06f64b3b0---41974670591.pdfIn PDF document text
- https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e410272939b27f0bd960ab90e81048f4/64337944382.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a491f9c34cd---45911149531.pdfIn PDF document text
- http://ctyrkolky-gamax.cz/data/dokumenty/gizipik.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e47d9f535---5242975361.pdfIn PDF document text
- http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73ff3f465---dafivesesipuxunu.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c0c9dc63a---misunivinoriziv.pdfIn PDF document text
- http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074813e55026---gewobirinunevexe.pdfIn PDF document text
- https://kuraniterbiye.com/resimler/files/zofekulejogojagujiwexifuj.pdfIn PDF document text
- http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3c038e2354ffd08dd4e0347db9cc6171/kagosobozedubewujelow.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63086e6b4a---25003384380.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/81428683510.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/603bfb1a1b6795cec72001b1cae01719/72355749556.pdfIn PDF document text
- http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/hhdnohkq5fq78l72f10j8ncogg/34297241536.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6uhvedukpgrdu9joc8u56n8ibj/luguzipujirosot.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-5/file/83622931771.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fbb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBB2	10936 bytes
SHA-256: `4737d17e8ce674c220a2bc5dd0f86f2c60e19dbb843b307eaccc724bf717d717`
`font_01_sfnt_off0001152f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1152F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D40	16252 bytes
SHA-256: `bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4`
`font_03_sfnt_off0001431c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1431C	17904 bytes
SHA-256: `bb9ac9d9f87a2838fc617ef1afba5ba4d2d9915794304e869badac8e925335f5`

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