PDF malware analysis — malicious · 851c7503e57ce5cf

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 11:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: e4ddbc5293bd501a5d4e17d6a9243fb4 SHA-1: b377e2a26b3de0f56bf06f1fb3478843e9569959 SHA-256: 851c7503e57ce5cf4150efee5474c0de5a1439455cd2800b62dd2cd99bcbf246

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' indicates the document may also attempt to trick users into calling a phone number, a common tactic in tech-support scams.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://pistant.ru/uplcv?utm_term=god+of+war+mobile+edition+apk PDF link annotation
- https://alwaysthesame.pt/site/upload/file/21456730982.pdfIn PDF document text
- http://sweed-trans.eu/ckfinder/userfiles/files/jodidurubenagejupog.pdfIn PDF document text
- http://arqing.es/ckfinder/userfiles/files/kugigirajatizakudo.pdfIn PDF document text
- http://ulleungroadtour.com/FileData/ckfinder/files/20210906_FBD0A50F7AA022E7.pdfIn PDF document text
- https://doellefjelde-mussemarked.dk/images/newsmail/file/sozifoxadezejumi.pdfIn PDF document text
- http://thewellmanteam.com/userfiles/files/85934947484.pdfIn PDF document text
- http://heydarbaba.org/resimler/files/69156307845.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767c26cd1d---rovojajodoretinitoxigedi.pdfIn PDF document text
- http://ritadas.in/userfiles/file/nuwosabafedirubafuga.pdfIn PDF document text
- http://monikaknoblochova.com/userfiles/file/bixeket.pdfIn PDF document text
- http://kapelski.pl/userfiles/file/6004190058.pdfIn PDF document text
- http://kantoromega.pl/userfiles/file/gamawit.pdfIn PDF document text
- http://gardatrans.com/content/Files/xazudux.pdfIn PDF document text
- http://smartickgroup.com/userfiles/20226071657.pdfIn PDF document text
- http://dietmoiquangle.com/webroot/img/files/85494595730.pdfIn PDF document text
- http://kibbkw.com/uploads/files/9276427430.pdfIn PDF document text
- http://sushi-belovo.ru/files/bolilojekaji.pdfIn PDF document text
- http://szerecsen.hu/editor_up/40083385734.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6hbp5t3taierrnee94ng96sm24/gubezonizu.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0b90492fde4cae457279c45f71eb0ab7/sibopevun.pdfIn PDF document text
- https://marikakozmetika.hu/editor_up/gofuruwumala.pdfIn PDF document text
- http://elitakhealing.com/ckfinder/userfiles/files/tokagewujosovozoxuretes.pdfIn PDF document text
- https://hanurichurch.org/ckfinder/userfiles/files/6306844814.pdfIn PDF document text
- https://ripedzn.com/app/webroot/files/fckeditor/file/fisupewezadeken.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_off0000d7d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7D8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000efef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFEF	10848 bytes
SHA-256: `35670ce88a0e1066e7771c08f161e3e3dea94358a2919c44da0f3fe3e7cc0b2e`
`font_02_sfnt_off000108ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108CE	17780 bytes
SHA-256: `fdb87661726876a55daa0174275d805dfa3dd5df6e07e84434efc772faa64482`

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