Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc5d0f87480a08a…

MALICIOUS

PDF

100.4 KB Created: 2021-06-27 20:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d16c46f7ec4d352692849e301cd010e2 SHA-1: c2d7eda5bf7caf03fa8e0e9e37e3328fb7dd6ab9 SHA-256: dfc5d0f87480a08aeaa173fd80290b63435e0bcb22cc511417bcdf4d818865f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of a QR code lure further supports a phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=vocabulary+workshop+level+c+unit+6+completing+the+sentence+answers PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/aca2b516f8a603de224d52501dc5892a/vamidixalefeme.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/67826352250.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/546c95e207f63b61acd1d5662b286e3f/55151623722.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/4462692828.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094854d3c995---kogapemabusivitaxobip.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8286abeaa5e31478a24d7f7fd9d712a2/mulobo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bf414a503e56829e401dcdf3a86242b6/bonevabejejebudi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c72e6e096ef---fedepobipiteba.pdfIn PDF document text
    • https://aashianarealty.com/file/naridazevufupezatarageke.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a5b57e99---tekezepanibinabidotuzi.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hb695r8mqvidslin2q2f4erco7/naserobazenogapog.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8294e1006---62995931496.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3h3lgu2t9gt7k2gv4c9lfqh681/somukogenifesozen.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e109e9b78---42212895074.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/aafb2f7cf584dfd7e0a03beb965edca8/89469757558.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/xuvirejujemosoxutume.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vulogivunudizoxunuran.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/727699414.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5b84d8610---36217781987.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b449c6a0825474fed2d9669cea0dbcc1/sewasufesevo.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/pojopudiponovasejewuf.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160887f5cacfad---66798087609.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d505a6af4904ee1c3cea4ecd9a478d06/paxiwubizimaw.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/tubesukowezeluru.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984e9521dec---mabosi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 11556 bytes
SHA-256: f74e23cf600855ff977a970c846acec6a9eb9dcdf553514e17f38cb1855e73c9
font_02_sfnt_off00013c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 16200 bytes
SHA-256: 2390b0577cb80755f132c16a684c36716f9f57296cc48d18619c0b0eb6d17370
font_03_sfnt_off00015204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15204 18388 bytes
SHA-256: fd56410c6519f567b39522912d5172b3df54636309fc776cc4c78b8577a37720

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