Malicious PDF — malware analysis report

Static analysis result for SHA-256 63af68160392ca1c…

MALICIOUS

PDF

101.2 KB Created: 2021-09-18 09:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f7312602fcaa393f09ecf5aade34bba SHA-1: f9bd8505a5f4126eac353b2b670ca1cfe9ef5158 SHA-256: 63af68160392ca1cf741fd8e25e0cf768980bce61a9a9f8a3bda166e0289eaf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure victims to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=configurar+cuenta+gmail+en+android+imap PDF link annotation
    • http://sgrappresentanze.eu/userfiles/files/27314274332.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/vagefeva.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/sajizuvikewe.pdfIn PDF document text
    • https://adikkedua.com/contents/files/lufupunogubekukojisutim.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/umn1usrhp755nlum4k0o3tj1h0/patejefefilabugesewabezi.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/fojak.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l2etloe6eo6670dsnni18prb9d/52497974204.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6aec2090---85777191904.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/pasapuziwevijowunozosotu.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/molizipusalila.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/13314874786.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/30792109524.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/volovagogupot.pdfIn PDF document text
    • http://gerocuki.hu/user/file/forajuvagizati.pdfIn PDF document text
    • http://banquat.com/userfiles/files/gidebajazi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/10059075276.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/31394741800.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161315b9da4cdc---43014314315.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///20620669400.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109141607068181.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/17085233205.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/tetuliziwilifil.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314031369609.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 10928 bytes
SHA-256: 49bbe9b9144187d9bf9bdc447d601f411d32a0bc6b1afbc87873cea0cb439550
font_02_sfnt_off0001535c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535C 19916 bytes
SHA-256: 3afee3817f7b271d25561b20abf5083c83b433be289479abb8ec4d211e15f649

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