Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af2140cc7de772a…

MALICIOUS

PDF

89.4 KB Created: 2021-06-29 01:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bfff381cee186ccd90a9385cdd132ac8 SHA-1: 640ef721393019d04668b8b5942c8d00bc7477b5 SHA-256: 1af2140cc7de772a2566ac00f37c1d2fcb726a58c8dc5bdff03a56ef31c14620
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites. While no executable scripts were extracted, the presence of numerous links to potentially malicious PDFs suggests an attempt to deliver further malware or phishing content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/vazisazozusakinedijevaxet.pdf In PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878943eb07---gimezufikiw.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6f35b180---89003281773.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/48719112151.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/54gd4rg3p6a7t3f138aloj6ugi/topezodoxujabavami.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a98a6456150---92938891121.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9c5e6969f7f67bcaa5f8094478e62b44/71169199692.pdfIn PDF document text
    • https://arerp.kr/data/file///83000146587.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5c94932f3e5a7c3cac192343d26f25e3/2412966458.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/temuxojefezudisoramuril.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/4196888232.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/36222484964.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/geburulaluk.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/66dbde40eb772f2a3f11cb5bacb3c00d/daxegejesugakasezojovej.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/safezobepovenogaseforegal.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4d234b2d---89559516197.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/66536030625.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080345c23897---76772167550.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/47801383518.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/dapitazogipuzonejaf.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/45788742027.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa65fa08601---33691906523.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ojmg91j573mc0vjrrkn0gbq8g4/gegasomomikilu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/88739298663.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fh3669l90p0lto70vtmv8j7mu7/78152381811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ipsilateral+tracheal+deviationPDF 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_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 10628 bytes
SHA-256: 31e56df4d40da43bfad7911195785ed814f165e54b5a29a4746bf4f4cc5da352
font_02_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 16628 bytes
SHA-256: 5abe0591244664ec761306795424ed46050983a716860bef141bdfc45d76f1d8

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