Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af2ade2ea31437c…

MALICIOUS

PDF

94.6 KB Created: 2021-08-08 22:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 193e042ad4ad9a8069a7dbad39401f0e SHA-1: 17bd1816371fa4f4f6fd6ea3ab19f9d8fd5d09dd SHA-256: 9af2ade2ea31437cc1de8ad63aa9ab2a43605af001b62672effb7302d40cc155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted from this sample, but the presence of multiple external URIs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://pamat.ro/UserFiles/file/7790695213.pdf In PDF document text
    • http://pressvaluation.net/userfiles/file/liseterezubuzunoz.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8047f352e6c0993d6b682e757fd32f4d/tenibodasi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/11470698798.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cec41b1a4---67931649474.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/59284961371.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8d28b232ba38b37b0d35893a1ae969b7/85965607128.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b15606da1f---8255498317.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8lq4eqnnung63umeoki1j9chkm/93249184539.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747abb206cd---nowibujafawotif.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/50302028886.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/wexigisuwaz.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a103621525d---66080329521.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e98c1222de192c70009de076cad6e2b6/zugigelameregat.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/a2c26829c624b83607baf9d6313192d3/fiput.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610586df834d7---giduta.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/88525826287.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e4a15c92---89474061513.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1f81b22f5bcbf049b68766b9375cd491/45325132624.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/buxoseni.pdfIn PDF document text
    • http://wohntraumgmbh.at/rimenipi.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/g0udvi0s6rdf9tdlalm5ap61hh/funubowakutunobutoset.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/pewikiremuterowo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d4ecce89---95506464006.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/geduxivovajamedikenosek.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/gekivizakotodupem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=%C3%A9+feriado+em+s%C3%A3o+paulo+hojePDF 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_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 11056 bytes
SHA-256: 086c92fc08b88b7a66fe4a275ee528e8ed569c88e41958e84d971860a86e8c52
font_02_sfnt_off000138d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D1 19724 bytes
SHA-256: 23e80d26968a1ac165b8fdc3369cd8032ad83127294be588d7956776cb1ff539