PDF malware analysis — malicious · 89843a5a6e1cd896

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 10:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 621696af53f78f326402d4946ffd528c SHA-1: 95d153291e85bd69caa1122b49caeda416e9610a SHA-256: 89843a5a6e1cd896bab3b970ce4c65ed8bf599a382f8428eb1c529406fe22f57

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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://synerhu.ru/uplcv?utm_term=cisco+chapter+3+test+answers PDF link annotation
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac99ee54aa---9402438329.pdfIn PDF document text
- http://firmen-bekleidung.at/userfiles/file/29608001181.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4542794ee---xubozafatagozagidulaxezo.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/503f6b9a0373a3d2aced1d28f17f05bc/15416744859.pdfIn PDF document text
- http://goref.ru/files/file/rewitovomunevoxigodaf.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/oo9e5fmi8ibi31jj57v3h25402/38891405232.pdfIn PDF document text
- http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079b380bf0fc---buziromigonazib.pdfIn PDF document text
- http://gemculture.com/userfiles/file/lexenedupesup.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27c0d56c04---28734898620.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7931e826---zajex.pdfIn PDF document text
- https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/la75pcmuvq8h0b82ei6ff7qsjk/gisiduxip.pdfIn PDF document text
- http://myexamadvisor.com/fck_uploads/files/dimexolodelejaxuwetagigat.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af841e1781a---48520379709.pdfIn PDF document text
- http://stellamaris.cz/userfiles/lubuzawemipolubon.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9ea85acinr8vk4l2820mt3ee2e/27347072406.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a4fa6aac---lodoledubali.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62de484dd---tejusosojolif.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/76216252b1c27428c99734ab35fd31ca/99235398856.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jkjo0u9an91lute5f1gqrab6bs/53045375313.pdfIn PDF document text
- https://gbagencement.fr/uploads/file/15837136392.pdfIn PDF document text
- http://dunajecbiala.pl/upload/File/dibazopovafovekaga.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a396b879b9e---joluzudekopug.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a09c57b678b---20650684224.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ba60d0fbb4360f8628516ae7e6527b0c/detigopefojuvu.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/dcb0f92aa6d6eba936c21663db4a6b57/26512401910.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/36264ec6e9384f397d3423b57dfce36a/97732579674.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_off0000ed4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED4F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010566.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10566	10716 bytes
SHA-256: `d24674be9069305093d370b54a94cb9cb31d71d5088316e46f949ef8d946f027`
`font_02_sfnt_off00011e1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E1A	16868 bytes
SHA-256: `c15aa93f9aa96b4162f77bd3e1ad8466a98b9444e3722b9a3e6f4a1e4fd95e38`

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