PDF malware analysis — malicious · c55b72a220516819

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 09:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: fee25004d4d03b2d01bb17bac0ec1dd7 SHA-1: 84892e5861def72913a6c131004bf5f2706a483d SHA-256: c55b72a220516819b2c2ae6076db074e10254a12aede79efbe9f7e02a006a24a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or SEO-poisoning campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=unexpressed+feelings+pdf PDF link annotation
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fda13ceb601---75613126590.pdfIn PDF document text
- https://fasaac.org/temp//files/memanomagiburimatixe.pdfIn PDF document text
- https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d1f262cb8465c619485e61ea8889d5b1/32984159956.pdfIn PDF document text
- http://bukharasuwanee.com/sites/default/files/file/70117907975.pdfIn PDF document text
- https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/39ec32467a10e14c3f53524de31c7c49/14039709112.pdfIn PDF document text
- https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/17a0c649dba7e1a65c328815370d9b57/26143781644.pdfIn PDF document text
- http://illinoislivestock.org/userfiles/file/2932221574.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j32bqe2cui6fforfc7unvuciev/56228469884.pdfIn PDF document text
- https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/99130138050.pdfIn PDF document text
- http://kiajihlava.cz/UserFiles/File/9732145470.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bd61d2cd---juxopanidu.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/572f8a0c6b6964c6e3f11d6b5e95ef80/2428842267.pdfIn PDF document text
- https://autotronics.vn/userfiles/file/69589938120.pdfIn PDF document text
- http://sumosushingrill.com/uploads/files/70377080355.pdfIn PDF document text
- http://crystal-lamp.ru/uploads/files/lalilawunurokeviwofar.pdfIn PDF document text
- http://retco.ge/ckfinder/userfiles/files/rerajobozijipexaxaguf.pdfIn PDF document text
- http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc6c3370b---80831588263.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/128007475070bb82a0c5349cd35585bc/wesuwubomunavavijuvadiwa.pdfIn PDF document text
- https://hnhaa.com/userfiles/tnejp//files/buxal.pdfIn PDF document text
- http://ecohost.ru/pics/images/file/53808021190.pdfIn PDF document text
- https://pnvvr.ro/userfiles/file/jemijev.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3i6dtotv5l54t0b3fv9ki29dak/difigezute.pdfIn PDF document text
- http://siblom.ru/files/upload/file/xuxujuk.pdfIn PDF document text
- http://haphadoor.com/upload/files/67355109380.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_off0000e345.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE345	18884 bytes
SHA-256: `2a01b85ae7f807b4647385a69dd27e4b9ecb5c5ae9c362b8b8c578aaf059cd17`
`font_01_sfnt_off000113ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113EE	10404 bytes
SHA-256: `c77ece1cc92439264d6ca6d794b12b6e659c655541887ad170a78dfccac56e28`
`font_02_sfnt_off00012b55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B55	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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