PDF malware analysis — malicious · eb83731d4859e072

MALICIOUS

PDF

88.7 KB Created: 2021-08-12 16:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: ef52b160f30730c046b6fb29dd10b26b SHA-1: 03b4c78879d7acb7dc0aafcc482d7f729c67c384 SHA-256: eb83731d4859e072bf20863b6b70ddae18528b7b43ff46091da5865062d3c36c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=how+to+write+business+goals+and+objectives PDF link annotation
- https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a7svdke1irlcrflfqd7qe5o7q7/jibib.pdfIn PDF document text
- https://bostaninsaat.com/image/files/jodafatabigobi.pdfIn PDF document text
- http://wowbond.com/upload/Fckeditor/file/xixitob.pdfIn PDF document text
- http://levne-pohary.cz/UserFiles/File/27602697531.pdfIn PDF document text
- https://liur-krd.ru/userfiles/file/72914294151.pdfIn PDF document text
- http://cncforginghammer.com/d/files/naresikeg.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160861606a37e7---xomomuto.pdfIn PDF document text
- https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087234562ce8---dorabobo.pdfIn PDF document text
- http://nhatrangpalace.vn/app/webroot/upload/files/buvito.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6294b789fd91b7cb6ccf87b65b2de991/70173393781.pdfIn PDF document text
- https://mahae.hu/files/files/zodiw.pdfIn PDF document text
- http://gumberryoleschool.com/clients/33891/File/mebinirozeretirozu.pdfIn PDF document text
- https://gikguamerica.com/userfiles/file/49876100233.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4b9c11650a307675181a37d8ca7bbb5a/mizuwozuvisotefivuko.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/ca18a1106d91a4b078fc1a27e40299ec/jezila.pdfIn PDF document text
- https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d76428fdb2bd6842a60da7aef80238a5/setez.pdfIn PDF document text
- http://servis-hradec.cz/files/file/33286120265.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/fe098330a734b2916d5d324de1b0882a/pitaki.pdfIn PDF document text
- https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2db94db995b973820ae530143ad8615f/rixajosugi.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r2h1c0s31c0kd6blemhi9ppi9v/gaxilafumelesijako.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a046c7dd3---godujobunuxiradufuzis.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608057b8b3cd7---benivavejoxolomudirikar.pdfIn PDF document text
- https://vibangnhadat.com/uploads/files/fikosebotaka.pdfIn PDF document text
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/770af3682c479c03814938b8b525656d/3650496456.pdfIn PDF document text
- https://sieuthigo.vn/upload/ck/files/sezajaxejafudekanagowowir.pdfIn PDF document text
- https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/98g1rlur2es28615qu5ec4m8f9/80137376156.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2582ce47ad---jasokupozedojibajita.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_off0000f6fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6FB	11060 bytes
SHA-256: `8721024b47867daf519227ae6ba85b2c8fa458bbe5836e1e6361c693b485acef`
`font_01_sfnt_off000110a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000128bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128BB	16344 bytes
SHA-256: `21d212830b19301b582a4aa8c250cc98cc6e44aeb6ce1a8c674d6d3fe990e321`

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