PDF malware analysis — malicious · 8f58dd2aab410cda

MALICIOUS

PDF

88.7 KB Created: 2021-08-25 07:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fef009fb514c59ceae0b5f3da90f0fb6 SHA-1: 4b0cb5565a11501ed16a39fb149cdbf22d228669 SHA-256: 8f58dd2aab410cda917f84c4c2faa9dd14db4385834ad76e81c9eafa9e1c9745

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs pointing to compromised websites, which are likely used to host malicious content or redirect users to phishing pages. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

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://nomylo.ru/uplcv?utm_term=goat+cheese+stuffed+dates+with+balsamic+reduction PDF link annotation
- https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/35b0fiupn4kpn5m64701js1gu0/maropigedafudoritokupa.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088f27c7e5f0---pexunezalanibajivuzasaxo.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e9195d36---86432325039.pdfIn PDF document text
- http://oshcongregation.com/userfiles/file/dijibeperutedomulan.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb494623b---2324430872.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607933aa90cbd---dejurixitonuzob.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ccvdkb27pfp40ro7k841j5ad0l/velisageremofoboseri.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160799a77ccd31---18478032795.pdfIn PDF document text
- http://boatmonies.com/uploads/files/benuderovigigexasopuf.pdfIn PDF document text
- http://sjhrz.com/images/upload/File/90668248474.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3da5ee72baee990eae51b43baa14e288/kuxosuxasazoxagekexak.pdfIn PDF document text
- https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b94d1127cb2---18055179021.pdfIn PDF document text
- https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/960727c5832ea00cb7069caac9325ee4/ferilosawetafamaxi.pdfIn PDF document text
- http://waterlootour.com/FileData/ckfinder/files/20210703_1DA069C320C2B52E.pdfIn PDF document text
- http://lso-msm.fr/userfiles/file/94553223882.pdfIn PDF document text
- http://agiusfuneraldirectors.com/files/file/61116694973.pdfIn PDF document text
- https://erdenetpost.mn/userfiles/files/51064490388.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3ff3733f---jogisifiwuvawewofadi.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/682046422497a8396248979f8fea48b1/52168483158.pdfIn PDF document text
- http://msamerica.net/clients/873634/File/vaneseb.pdfIn PDF document text
- http://planbmedia.hu/files/68848815203.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706a04c8a33---movepoduwupud.pdfIn PDF document text
- http://aqs-group.it/userfiles/files/66147203156.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd37d757a5---pepevozixorotejixunas.pdfIn PDF document text
- http://dreamcatcherltd.com/userfiles/file/kurajumafimuzawodixiroxit.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0d9643d3---nejetefubenixit.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_off0000f4d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4D9	17328 bytes
SHA-256: `b719fb62a7b3340cac6121c6a8814e4f14810aaaad83cb9941a5a37e721076a6`
`font_01_sfnt_off000121ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121EC	11108 bytes
SHA-256: `71cd5383848e2387c810f82fd975c4d92c5370e21a613b8d04e58c9d2b880876`
`font_02_sfnt_off00013bb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BB4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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