PDF malware analysis — malicious · 2bd75e978aed776d

MALICIOUS

PDF

93.8 KB Created: 2021-08-04 12:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: a4bbf2283213d76d55bcb1d7267d77a8 SHA-1: 6a279dbee75f129c6da61b2190815a5cd816dd60 SHA-256: 2bd75e978aed776d8871cc8de8cd3eeb9de80f0492a115c4e1b1bdfa784fe225

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a redirector for phishing or malware delivery. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9910

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://catamma.ru/uplcv?utm_term=blank+bookmark+template+psd PDF link annotation
- http://urparitet.ru/admin/ckfinder/userfiles/files/1011176102.pdfIn PDF document text
- http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3ac11932a---77753792243.pdfIn PDF document text
- https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8995dtm0h83ncfeon3clm5ckek/77044071118.pdfIn PDF document text
- http://c2ctrading.org/cms_upload/files/95768328638.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/63205742295.pdfIn PDF document text
- http://mfcwestenkwartier.nl/beta/userfiles/file/44276550705.pdfIn PDF document text
- https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e82c579d64---rakuwidimi.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fd929933018d334b53154e89a6f66104/ruwixozubixidet.pdfIn PDF document text
- http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/zamezapedunubamumer.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56e1d21c7c.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/dad13252a440f96d6a109529897015ed/mogezururuvejurulaja.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/mupetuvus.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/06de7d0ee44ed85d2571674b0d72c3be/zekininopi.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2962e486418cd9ab5112f763cbb6253b/9202302212.pdfIn PDF document text
- http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/tamokerukosivufemux.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf564071e51---ripev.pdfIn PDF document text
- http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/5647417383.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4270d5fee---lobadulorukikoz.pdfIn PDF document text
- https://lapalettedesarts.fr/gestion/file/82792847638.pdfIn PDF document text
- http://apexnepaltravel.com/userfiles/file/loragu.pdfIn PDF document text
- http://roycraft.ca/userfiles/file/47876173287.pdfIn PDF document text
- https://rivaflo-south.in/userfiles/files/fajesudebu.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/921891e79a388cb20d4ac1ad71910212/61185416773.pdfIn PDF document text
- http://locnuocvietmy.com/Images_upload/files/20485648026.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e938060e771079faf287f3b926fdadec/11993869240.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62d07af6f3---27475592999.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f6fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6FE	16660 bytes
SHA-256: `08560d9332aea9f7addda33a78544b7eed1b018efc23ddf5b5458a8394874b43`
`font_01_sfnt_off00012284.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12284	10748 bytes
SHA-256: `a5e41af18c20bfdc3bc70f90c0c728ffbfc0657c3888789835794233ba8e3ce3`
`font_02_sfnt_off00013b05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B05	16080 bytes
SHA-256: `c9fa871d706934500ba7362bcc2679cd089fe7f1d29a584b92b55675ed6be739`
`font_03_sfnt_off0001502d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1502D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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