Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b028e844fb6b9b…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 04:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 876ef9daa5426b86359fb03accadd7d1 SHA-1: 9591e268d6a53c09686b127d5ae2a53c8ccdeb2b SHA-256: 40b028e844fb6b9bf47c1db38aa8aa74201ec3c05ac9c0e0a37b94bc42a15ed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the nature of the link farm and the presence of external URLs point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=pradeep+publications+chemistry+12+pdf+free+download
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf93bb5a04---kepasun.pdf
    • http://aimecostruzioni.it/userfiles/files/40503462297.pdf
    • http://www.kilincsweb.hu/fileok/file/6570173581.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aec14f65a13---sigafetapedipolixar.pdf
    • https://bevelec.com/bevelec/dossierMois/file/xotelor.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/8t75eaubbcqbg8eih5rit7aaj0/roxivadumem.pdf
    • http://paillasse.hu/userfiles/file/gofeviredijono.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/42258eb99217f27068e9eba881427d4c/93784706055.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sbmnmhf9j7fm120usus0uk3ig2/94244810877.pdf
    • http://tuning-zone.eu/userfiles/file/20452932264.pdf
    • http://baaningdoi.com/file_media/file_image/file/titatebejakifuganototafe.pdf
    • http://zwickerfoto.hu/_user/file/mexewiwivejomiwakurifezaj.pdf
    • https://promise-land.com/upload/file/gasidu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/daf337aba0e3bc3d5b9c96625ef17d03/54061453454.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71c2ce6bd---3948097278.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/59495321a960c477d998af1db12008d1/pututuvokizegakabepupap.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/85986228720.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/6377988884.pdf
    • https://noddy.nu/images/file/jedafur.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/01c40b603920a7af3f35e587d5ee9f65/foguw.pdf
    • https://protradingindia.net/userfiles/file/60948112161.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bb4c54752121144159b97af325b2cb85/dasaxalu.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_off0000e176.bin
45aa2b627f810c1468a8a15527f1bf761bee903eed15584f689d19d9508481fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 17388 bytes
font_01_sfnt_off00010f0b.bin
a3dd410b6d750402be329e581562549213be0fd5d6fa0d746788728b91c78801
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 11500 bytes
font_02_sfnt_off000129f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 16792 bytes