Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd281200aaf3ee57…

MALICIOUS

PDF

78.7 KB Created: 2021-06-28 21:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6793248bc2329e408b263f9628b1b5af SHA-1: 6f9983a0e5c71a70658114efc4e7e0eb450c4d5e SHA-256: dd281200aaf3ee576ab930179a4e1d966d99c1286bcd0f3ad98e33cbc784c37c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=what%27s+your+color+character
    • https://a2designbg.com/userfiles/file/zuded.pdf
    • http://arunimaflavours.com/userfiles/file/rinenug.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a738396faaa---92402057720.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bjtblcgc9gss1vsqtfiu046ne2/fepax.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed570aa68a---sovepenujede.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/foiqer7v8589k0hb2t42c9ek17/5884491338.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/metirodonovewukukitonipef.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfffc1723c---28572616536.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc33fc3bee8---19911307786.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b7f8d96bb7224ce0ca2336025cb5539f/54494107213.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35dd48e5a---49032999724.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c6531f3b---tenalobazulupol.pdf
    • http://pelesiuvalymas.lt/i/File/jugaxonufewowamuguk.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d41e05a904---sopujojeziripa.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ced90e4e---ruwenekibevuna.pdf
    • http://bhhangkhong.com/upload/images/files/nilawizebinuzaxavur.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/s3e3o352fu92phfhoothg96ci5/2649132787.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8bee4fbc9ff9244b34cc5b85d39e7068/fodujolelob.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/efe06c38564b42e884b588cf0cc0ac2a/gitixulolipinab.pdf
    • https://camgloberealtor.com/userfiles/file/10656238514.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_off0000d3b7.bin
a98eb954cd693fb5d31252b9c649cf3e033d4a13f13c42846b14608e29cae0a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 16344 bytes
font_01_sfnt_off0000fe34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 16792 bytes
font_02_sfnt_off0001164b.bin
eb12269c2e0f194a9d6214867b60307c5a3902806ef7580b1e75753fdd548f01
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 10372 bytes