PDF malware analysis — malicious · 4765a205bae8d26a

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 16:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e728688351303838f9a8882bacee1121 SHA-1: a186b8a02a6baa65d746db936369b4930d0ff67a SHA-256: 4765a205bae8d26a43df15cd7d6781db4793dedd4c86e43ac4cc0aec30aac026

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use vulnerable CMS plugins. This behavior is indicative of a phishing or malware distribution campaign, where the PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier strongly support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://archism.ru/uplcv?utm_term=fundamentals+of+statistical+signal+processing+detection+theory+pdf+download PDF link annotation
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6929e9e0b1---58713562144.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/09be9a0f6743f6bd7daec1eaf915d361/31429618129.pdfIn PDF document text
- http://wjvanderheidedienstverlening.nl/uploads/file/nobabugubebomi.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ob26dcvmgl1nhb7nekjdsubgm7/ninites.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/04sdeumt08ek8beqcnd5gl5i96/rizazezepebirubuvasinoka.pdfIn PDF document text
- https://cdmsig1.com/ckfinder/userfiles/files/88300532116.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160729cd4a1576---75152263685.pdfIn PDF document text
- http://residencelesaline.it/userfiles/files/10335139314.pdfIn PDF document text
- https://ohcsi.com/ckfinder/userfiles/files/79197641630.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0po8bhkvjkoq9c6f0t0bki3bm2/76399283103.pdfIn PDF document text
- http://impactpluslearning.com/ckfinder/userfiles/files/25871477592.pdfIn PDF document text
- http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608311e3cc010---65572633849.pdfIn PDF document text
- http://mini-garden.ru/userfiles/file/5699385363.pdfIn PDF document text
- http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac04448faf---24700305646.pdfIn PDF document text
- https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9f141b7446d543ac347698948f39db68/pedikurubupewofuwoxixajik.pdfIn PDF document text
- http://niestachow.pl/data/aktualnosci_imgs/file/wesiwovezumigimi.pdfIn PDF document text
- http://scandirent-new.ru/uploads/assets/file/70865976793.pdfIn PDF document text
- https://guineaservicesproviders.com/gsp/files/goxifexowovexit.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/u942qmm4fr92l3jo7p995327g3/16848098245.pdfIn PDF document text
- https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd3f98d3b---42266829785.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161009288988f1---30114252226.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf12d74c1e---90842128212.pdfIn PDF document text
- http://drapikowski.pl/uploaded/fck_files/file/70961785241.pdfIn PDF document text
- https://www.nvsrolko.org/ckfinder/userfiles/files/7799209748.pdfIn PDF document text
- http://dellalontra.it/userfiles/files/sififulivufilabafo.pdfIn PDF document text
- http://e-motyle.natura2000.pl/imgturysta/files/313218077.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_off0000bad2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAD2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d2e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2E9	11344 bytes
SHA-256: `c537c21615cd79fbb7f14352300de077ff6290b05d9f45d4056457df0099e2cb`
`font_02_sfnt_off0000ed3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED3E	15684 bytes
SHA-256: `8af0692b2e4b90943281fa3228fe92e890716794d12c0a36d61c27a8632f161c`

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