Malicious PDF — malware analysis report

Static analysis result for SHA-256 744c80faa387a7ff…

MALICIOUS

PDF

84.0 KB Created: 2021-06-25 22:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afa894975a461957a2c748bb973957c1 SHA-1: 2b3a9ba981718c73b0a2dfaf41250ab4f49f40f6 SHA-256: 744c80faa387a7ffe3a3c742e8a8a2c8c83d8a727b0379def3705841d97662b9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this assessment.

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608beed773147---79223415607.pdf In PDF document text
    • http://kiavysocina.cz/UserFiles/File/zigivo.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105210304391045.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae0d38f4ad---29776858865.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7222489f9---1094186761.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/wimuraduxufawozovafubo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b72329a2cbf3361adcfde1f6b6aa5237/45659112678.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/64656285445.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1f343468c155613184718d4f6336346f/61555104412.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad882676767---7257917204.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/ruvimujexupijaxuw.pdfIn PDF document text
    • https://o-dance.com/upload/files/11827460674.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/97336033824.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896854b26aa---namorugoligazozuji.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/87707692555.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/66732624214.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b53163e1a5f---18013632532.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5694079c8---3866490278.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3739a65dd2---mokijexetuga.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d3404ccf9a52c84f6c7ca157e8d4b9af/23990346470.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609888497e33f---1376532711.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7hfsuq4bn7pmevjqu96dnk2200/tofipenonasituj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vt+dividend+yieldPDF 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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 18040 bytes
SHA-256: ab153ce819ec7a572f7b62d59560c7f80d1f9726afafd00c13a1e6e0249f880d
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 9840 bytes
SHA-256: 68ce4911aa82973388fa124b23ebc8bc691f8676d4fed0e0d138335244d42239
font_02_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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