PDF malware analysis — malicious · 61ba1c2a8f0eb516

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 18:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: c014e51111aea70ce872ffd5f3813402 SHA-1: 6799a274c879b95bed0c22d594bc3229ab74584d SHA-256: 61ba1c2a8f0eb516eb49fd83716eede4c06d5a2d314bd0b29d4fba13b1262a35

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=blood+relations+in+telugu+pdf PDF link annotation
- http://tw-sincere.com/upfiles/editor/files/14851465941.pdfIn PDF document text
- http://misterholidaysanprisco.it/userfiles/files/941736539.pdfIn PDF document text
- http://mlsy.cz/images/file/files/8882502072.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddeb16128---xodakapukozikuge.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16089447ce5030---4343629120.pdfIn PDF document text
- http://yung-shun.com/userfiles/file/lesanodil.pdfIn PDF document text
- http://tecksco.com/upload/files/57759901267.pdfIn PDF document text
- https://abofahed.com/userfiles/file/mabatakevan.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc53c3450---kimivoxugafolilukoloje.pdfIn PDF document text
- https://digireg.dk/upload/nanogal.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160911f150f1c9---zatesu.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ad220fdf2143d40aaf719df657e930fd/31444022944.pdfIn PDF document text
- https://www.alapan.org/fckimages/file/mosobefujekogewuwakafuvoz.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1623495890.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5f1426323e953dd7c900cc960ea1f0b8/pogesovuje.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2483baca00c6e65e6b0bd75d9aca55e3/losazewitik.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/nh1rnsfmi88ej9j1hv3kjqd5nt/98489807971.pdfIn PDF document text
- http://yacpa.org/yacpafiles/file/25443331330.pdfIn PDF document text
- http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/86037604918.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9b391a664b4aa8fc7cb493e918622de2/fezezulebege.pdfIn PDF document text
- https://funcarele.com/ckfinder/userfiles/files/bitusexodatef.pdfIn PDF document text
- https://taxfirma.com/userfiles/file/zeralator.pdfIn PDF document text
- http://beiks.info/public/file/bagibuvi.pdfIn PDF document text
- http://bobmeetin.com/media/galleries/files/72215100083.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_off0000c583.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC583	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD95	19276 bytes
SHA-256: `67532fb3525905e6477578d6d3fe4f9230d23c6af676e18ccf4c23eed9648061`
`font_02_sfnt_off00010f63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F63	10824 bytes
SHA-256: `a8611159d7d0ac6074daa7d56754f023497560fe123b2bf03af13964b4ceba04`

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