Malicious PDF — malware analysis report

Static analysis result for SHA-256 891d5aa5432148c1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 22:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d07c83517eae7a090a40482cec960012 SHA-1: 309bcbb45de42202b8e016891b0f63e883d7fec2 SHA-256: 891d5aa5432148c1468ee07772ce139ad28a1d4e59c1822a374b209d041fa99a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term=enable+cookies+on+chrome+android' in one URL indicates a potential attempt to trick users into enabling cookies, possibly as part of a credential harvesting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pass-eco-energies.com/ckfinder/userfiles/files/87731533052.pdf In PDF document text
    • https://miet.hu/kepek/24365407398.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/3694154256.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/48ce0a6ae2406bbd1ad999cedd70d422/rapeburuvajabuge.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vezezapejobupitota.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/rigegepozevuzefijigenuw.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/danibulakepibufip.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/6041541898.pdfIn PDF document text
    • http://olympusflights.com/files/files/rugivomaxozaweb.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/xevulivuxonofixino.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/bafazusevobewelopimap.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161479c3642cab---tajovususuzegiji.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/87880965237.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ka7mebnvhtijajilcokhqotf42/81776038009.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/22029959668.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d7a69d8f632ccd6bd6c9778a244d2511/gemosogeke.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/bexit.pdfIn PDF document text
    • https://marosme.ro/hirek/file/90986524266.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/4921311376.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/75161805540.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/mitixuwasevax.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df5dd0874f---76542760896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=enable+cookies+on+chrome+androidPDF link annotation
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 18080 bytes
SHA-256: 79a94ede6e2113c8e7930ea50b065db092bd4e323a21afa668865e612a1f8e7b
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 10752 bytes
SHA-256: ddde68b8392927c824896855a01208f7f07f12522a491317ec236493f6450150