PDF malware analysis — malicious · db5c26b25a4e0ef6

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 11:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 02d01ad97aae7a910fd79f3aed6086d9 SHA-1: 74541433cb322262fde4acfa36f875a6291cebd1 SHA-256: db5c26b25a4e0ef69d0459fd759799ebe1bf87ecd12998ee237f93edb3b9fd03

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and links to compromised CMS upload storage suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=brand+manager+cv+example PDF link annotation
- http://les-dvorik.ru/userfiles/file/49797320298.pdfIn PDF document text
- http://gokea.org/upload/editor/files/69017087686.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/54de0236ab63e627428e95c49761d27f/80579242360.pdfIn PDF document text
- https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/da6mluc3g5b93rcm5f3lnn2mm2/begoridufeni.pdfIn PDF document text
- https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/46761625893.pdfIn PDF document text
- http://milwaukee.center/userfiles/file/kovanewinazarogeduf.pdfIn PDF document text
- http://pechati-piter.ru/userfiles/file/vesaxesaviliter.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/51503af03935366d032c02c04928086c/21389326359.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9177d503f1---noguxonibabig.pdfIn PDF document text
- http://yeditepegumruk.com/userfiles/50649713455.pdfIn PDF document text
- http://bezagsecurity.cz/userfiles/kuwarudusal.pdfIn PDF document text
- https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6e53949b05fe49159bf4a07eecb12685/85290970878.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b53b43723---xufog.pdfIn PDF document text
- http://fairfresh.net/assets/admin/ckeditorimage/files/tidawija.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f2dd8e51---78691453321.pdfIn PDF document text
- https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/74370698710.pdfIn PDF document text
- http://kiddeefire.com/media/userfiles/files/dikifof.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f32eb2ca0---tisafavijowod.pdfIn PDF document text
- http://agataklimowska.pl/userfiles/file/85925600846.pdfIn PDF document text
- http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/i8aijj0ik67srmmbkd0m5vaf2cgha8jr/kowujutikukevaneva.pdfIn PDF document text
- http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ad8c4d2b1458502eb692375b29224667/fenabutapabogelosuluvobow.pdfIn PDF document text
- https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/mowuzig.pdfIn PDF document text
- http://dopuskvsro.ru/UserFiles/witaxojamufa.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c331e9f9a642a6422dc5e89910b47221/44531213334.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_off0000d323.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD323	10600 bytes
SHA-256: `a65b9b9d767b9f7e00cd9d743ef17b0bb79d4839efed9481114113b902b6dce8`
`font_01_sfnt_off0000eb1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB1D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001032f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1032F	17308 bytes
SHA-256: `5748f7994a8283977e9bcd8b7e4f7d401d8156d049fa86374aa8a0ffdd534162`

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