Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f1a80f0289869f…

MALICIOUS

PDF

75.2 KB Created: 2021-07-09 22:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69479e6c5f05bd180a387948c2868ea3 SHA-1: a823d573ed5d3a66a7efd672a91db3b56c87b4dd SHA-256: 20f1a80f0289869f7f5a4a68d91e88af50ca9dabb06d151c072f679eebfe9301
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9e9f08b4---292559613.pdf, suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URI heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=wiz+khalifa+you+and+your+friends
    • https://getadoc.in/ckfinder/userfiles/files/61575309120.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8413274fa1ecbd35d16137feab8135f/25513297698.pdf
    • http://www.puhito.hu/uploads/68634334881.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608220a81ee70---40826148110.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9e9f08b4---292559613.pdf
    • https://lasanisports.com/files/75057510803.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/47726250991.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84bd25165d---siraxorigeji.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/fotajevemizup.pdf
    • http://pneusmarene.it/images/file/33304842340.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hr3ds3327o1j6d3lc9dd2m1n3p/wiguvib.pdf
    • http://shuimotongyuan.com/userfiles/file/46008530079.pdf
    • https://beauty-full.ru/uploads/files/nexex.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3affb8d17dec20119bc2134003eba58e/badefezodanemoles.pdf
    • https://sunarchegypt.com/userfiles/file/68211807632.pdf
    • https://pet-fashion.ro/mm/file/15830702741.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/m0f0dk0rlkuitm2dd2k2krn6v1/73280233678.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f54867d8e---5380464817.pdf
    • http://www.zaluziemalina.cz/userfiles/file/sofixola.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160752e2694b01---siluzuluvoroxo.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/71111623c9f55c5954bc631a2385849e/xoxerikimosawisozisaduwu.pdf
    • http://batiment-tunisie.com/userfiles/file/36072543492.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c64941d91---81970759603.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ff84a1e8---jimam.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df4a8e8f8---nukibepez.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0enbt90tq894afvl12849sgm75/37004145488.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/971bf58d7b2e07583133401892ca2f33/5004421510.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 16792 bytes
font_01_sfnt_off0000daad.bin
4dd27ae711f7da783bbd8835ba289b4a2b137e55c3c32d49bdf771a337758e33
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10712 bytes
font_02_sfnt_off0000f33f.bin
b6356e8b8354670f97d687a79bc3a09abf0ead744fff2b8c9de28dcfc69c2b49
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 17092 bytes