PDF malware analysis — malicious · af9f6c5970681e79

MALICIOUS

PDF

70.9 KB Created: 2021-09-15 18:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: ad4806c26a3ca77c7a3a8461614a718d SHA-1: b4435ce5929cd1bb00e14f7fb2bd4da07c637b9a SHA-256: af9f6c5970681e79a38f826e26f4c5704d190c4349163b38f2cfe5fd73ea1059

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI heuristics and link farm indicators further supports this assessment.

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=android+send+email+without+intent PDF link annotation
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2112b326---97717713706.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef914f10d9---92282683400.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/97562643194.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139860e3b125---67200967572.pdfIn PDF document text
- http://ziconiavip.com/uploadfck/file/terelafoxojebil.pdfIn PDF document text
- http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/widutem.pdfIn PDF document text
- https://astdubai.co/userfiles/files/lonozolosefizajume.pdfIn PDF document text
- http://puntolinea.org/userfiles/files/betamumele.pdfIn PDF document text
- http://kartywspomnien.pl/uploads/assets/file/81742257031.pdfIn PDF document text
- https://guruamardaspublicschool.com/userfiles/files/67887916619.pdfIn PDF document text
- http://sure2trips.com/bot/ckfinder/uf/files/70833655258.pdfIn PDF document text
- http://eshop-kocicinadeje.cz/files/file/fezirusiteretibidugulebom.pdfIn PDF document text
- http://architettipassarinmarzotto.com/userfiles/files/disibaluwukogamozuli.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/64832139217.pdfIn PDF document text
- http://www.terresdescaraibes.fr/file/12659063736.pdfIn PDF document text
- http://rsti.biz/files/fck/file/katojujomutewakok.pdfIn PDF document text
- http://boschvietnam.com/files/usersfiles/files/waxexurakebovutakazu.pdfIn PDF document text
- http://www.mecateengenharia.com.br/ckfinder/userfiles/files/bivebeniriv.pdfIn PDF document text
- https://baxsporthorses.nl/userfiles/file/28771851823.pdfIn PDF document text
- https://badeluxe.com/userfiles/files/98683415304.pdfIn PDF document text
- http://kuryakyn.ru/userfiles/file/rovuvaxonuwesopes.pdfIn PDF document text
- https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fitubemumegokadozirevog.pdfIn PDF document text
- http://puntolinea.org/userfiles/files/62591621812.pdfIn PDF document text
- http://stellar-toys.com/ckfinder/userfiles/files/wezusak.pdfIn PDF document text
- https://dondepodemosir.com/userfiles/file/wepewezitone.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_off0000b531.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB531	10680 bytes
SHA-256: `80db41413254dec490d5b73dc026b993539041d6e66c0ca4e9a3b2cfe32ddbb2`
`font_01_sfnt_off0000cd8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD8E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e5a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A0	15940 bytes
SHA-256: `5add86930e465803bd91667f335d151b641ff2198e124c2b0d8b9758576a6f83`

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