PDF malware analysis — malicious · 18391c50285e91d6

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 19:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b2cca81a3d350de4303141b8b25dc20f SHA-1: 90e514dfa06b6dd15e6f67042c500c54d34c1031 SHA-256: 18391c50285e91d63a1dc9fb721a1df02ae37f97708509357b4b071b42f41e56

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, presenting numerous URLs that lead to compromised WordPress uploads and disposable hosting sites, disguised with terms like 'download pokemon go mod'. These links likely serve to distribute further malware or phishing content, making the PDF a component of a broader phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=download+pokemon+go+mod PDF link annotation
- http://stin-verdon.fr/assets/Image/files/jezisotipu.pdfIn PDF document text
- http://baggiez.net/userfiles/file/sajujegijowom.pdfIn PDF document text
- http://biosafety.biz/ckfinder/userfiles/files/jowunabelafefumud.pdfIn PDF document text
- http://honghuibio.com/d/files/63078450395.pdfIn PDF document text
- https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3454b5187e7a7618c3d93e09ca5b1eaf/86670517641.pdfIn PDF document text
- http://hotelpenza58.ru/ckfinder/userfiles/files/17072505068.pdfIn PDF document text
- http://gowowdeli.com/uploads/files/powapigogafutarukawedibaz.pdfIn PDF document text
- http://17njl.com/userfiles/files/67995804220.pdfIn PDF document text
- https://5udua.com/contents/files/55443292500.pdfIn PDF document text
- https://florissantdesign.nl/docs/Image/file/gafazitajokoja.pdfIn PDF document text
- http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161324b009e8dc---36512238135.pdfIn PDF document text
- https://aicpwdosaeast.com/ckfinder/userfiles/files/tiguzuwosejenagakubam.pdfIn PDF document text
- http://beming.com/ressource/site-image/files/xepapefotisawojof.pdfIn PDF document text
- https://rugsdirect4u.com/uploadedfiles/file/kusagawotorakisa.pdfIn PDF document text
- http://huyndaicaudien.com/upload/files/desisurotepezalemu.pdfIn PDF document text
- http://hotel-gerard-dalsace.com/upload/document/74128203274.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420020711da---58257045871.pdfIn PDF document text
- https://madame-tina.com/ckfinder/userfiles/files/36224540482.pdfIn PDF document text
- http://7m-shop.com/userfiles/file/85968089989.pdfIn PDF document text
- http://jyotiacademicpress.org/uploads/file/kibaruxumebutufiwipe.pdfIn PDF document text
- http://clerus.hu/files/file/xedokolodubuzegufaku.pdfIn PDF document text
- http://cp-tournament.org/ckfinder/userfiles/files/bopokidotazexawezamu.pdfIn PDF document text
- http://esrafisek.com/images_upload/files/juraxomemaraxuvigovekipi.pdfIn PDF document text
- https://dijitalsanat.link/upload/files/27116886203.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cc27.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC27	16104 bytes
SHA-256: `f06cddf61c9925e39e47a8b8d88d5d2c108808d867bf63b528aab798a6fb49b7`
`font_01_sfnt_off0000e17d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE17D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f994.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF994	10456 bytes
SHA-256: `50c1f555dfaa4909763b6bd2edc4d2bce97f378265bd14ba1437b85ff28c71b3`
`font_03_sfnt_off00011117.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11117	20336 bytes
SHA-256: `e8d77c0a2588e3c696fe95a43bc553e2e102b0c2161c2f714776ab0293a9a140`

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