PDF malware analysis — malicious · c4efbd64bdc9f1a1

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 10:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 01c25478b1555f1281d05375758f9e15 SHA-1: c8d3cfc7879b3c2a88adc4e1d000e953c4c6b23a SHA-256: c4efbd64bdc9f1a1fbe9a319d4f7c350b338517dee3f4181c66eed60876d00c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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 http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/o9q88gknnec9nlnig0kf0uhdea/pixopirigovozuwawuxute.pdf In PDF document text
- http://charontrade.hu/data/file/betusifoz.pdfIn PDF document text
- https://ddshower.com/ckfinder/userfiles/files/potefuwor.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/monubuvafidululenamukudig.pdfIn PDF document text
- http://diencongnghiepvohoang.com/uploads/files/gewagajumiluma.pdfIn PDF document text
- http://argol-editions.fr/userfiles/file/92200702502.pdfIn PDF document text
- http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/kosulitikodikewijimijo.pdfIn PDF document text
- http://heyibnb.com/CKEdit/upload/files/1863705853.pdfIn PDF document text
- http://neodentpetrosino.it/userfiles/files/vepajubafipuxexunivunode.pdfIn PDF document text
- http://youandisagenix.com/ckfinder/userfiles/files/kunikudufemexebu.pdfIn PDF document text
- http://www.greenfield-sustainability.com/images/files/wugowajelamolidiviku.pdfIn PDF document text
- http://urbanconstructions.org/images/uploadedimages/file/xukedaxole.pdfIn PDF document text
- http://tantex.org/tantex/tantexuserfiles/file/zagipuxapefabunu.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bnjjbbbdus2p10b1mpupatvru4/deduwozipamozusone.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0tcre0obo5vsp3hckhclrjl3t7/64491920071.pdfIn PDF document text
- http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b131fa6ee84---67499526664.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bfc37ccff---18021095268.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/aov5k025ltumg9fbbdfijapkd3/69315187528.pdfIn PDF document text
- http://aliguoriarchitetto.eu/userfiles/files/30376395207.pdfIn PDF document text
- http://innovatepc.com/userfiles/file/zipuju.pdfIn PDF document text
- https://www.domosystem.gr/ckfinder/userfiles/files/jubazelu.pdfIn PDF document text
- http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/ruxoxodigiwepifol.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9b6ea13a6---44659442028.pdfIn PDF document text
- http://musicpark-live.de/userfiles/file/24342427749.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=alcohol+and+its+effects+on+the+body+worksheet+answersPDF link annotation
- 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_off0000da6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA6B	15956 bytes
SHA-256: `af2f701dc56a0b8315bd2e78864000e570295e7ae9f42178b2ae64e98c04b953`
`font_01_sfnt_off00010384.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10384	10988 bytes
SHA-256: `a2909df4760f8663d0d44d3b48427e1413f9d0c30257bce1e66323ff44a2c945`
`font_02_sfnt_off00011d12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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