PDF malware analysis — malicious · dc700f02e299175c

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 03:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 364e1ce53c45a3411c6aab7b65e78864 SHA-1: 91674b16eb2b3d2adb2e0a542431b4237e24b18e SHA-256: dc700f02e299175c9c319829d9af58d251a72d86aaf15a4df99b94339739cc2b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many associated with disposable hosting or compromised sites, strongly suggests a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=1+step+equations+worksheet+addition+subtraction PDF link annotation
- http://bagiez.com/userfiles/file/98045076805.pdfIn PDF document text
- https://penzionradvanice.cz/res/file/temonejudomep.pdfIn PDF document text
- https://trexanh.net/upload/files/datetageselixi.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/n98hm8cq9pp8ocdkvjarr588bj/37155204247.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6b9bf03bad6572209ec8b06dd99852f4/viwowemidekapu.pdfIn PDF document text
- http://vanlysecurity.vn/vanly/album/files/bagudofetapud.pdfIn PDF document text
- http://keralabiblesociety.com/fck_uploads/file/geloduxovixikekisam.pdfIn PDF document text
- http://southport1969.com/clients/861680/File/798379153.pdfIn PDF document text
- https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/041371b25f480d1a97e23585f1dbff23/lekuwaseluv.pdfIn PDF document text
- http://eltdb.com/UserFiles/files/mopawufutujimovutoduxagi.pdfIn PDF document text
- http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/77fquhgilgbdqjrjpuu1ducfop/26872213684.pdfIn PDF document text
- http://aelma.com/sites/default/userfiles/file/23282593412.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d8412ab0949bf8b206d71cd55424e5af/96786353982.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/22087720110.pdfIn PDF document text
- https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/e29ququgf44ulj6u98q3db7ch3/kiladolodaladugeparuliwe.pdfIn PDF document text
- http://capitolmetrophysicaltherapy.com/files/files/17388703571.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4c422365e---savike.pdfIn PDF document text
- http://daehwa.info/uploaded/file/jikabevi.pdfIn PDF document text
- https://asiarsolutions.com/userfiles/file/16645163472.pdfIn PDF document text
- https://resonanceacteurs.nl/userfiles/file/dejazorexaba.pdfIn PDF document text
- https://aczv.fr/userfiles/file/57388130870.pdfIn PDF document text
- http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/jemunuxazoxukebugisewu.pdfIn PDF document text
- https://foodsafebox.com/ckfinder/userfiles/files/32727106533.pdfIn PDF document text
- https://jobtiara.com/files/files/33605368520.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_off0000beba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEBA	11084 bytes
SHA-256: `5cf2cfcea0a260fa7f8d28e5f4d345f77976bc45b9f27c7e0d9d04fe3f68e5e8`
`font_01_sfnt_off0000d82e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD82E	16384 bytes
SHA-256: `a212a072b8aa4409e6e14c07527c3859b8da7c7d67a39a4e171ecde25ce4e1fe`
`font_02_sfnt_off00010299.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10299	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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