Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fb725568197333…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 14:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4de83072ca3023c551abfff8551e9b4 SHA-1: ae4c11bfc8264f9509efad140da7b4da2410510b SHA-256: c2fb7255681973337d72d08e569d652ffd6db093ac400656f12dda3d0f16e490
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0hf8kcujvsn9rpu5hktg6bl3j7/zunaxixesufesarasim.pdf In PDF document text
    • https://mollis.rs//files/jogupovo.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/segileso.pdfIn PDF document text
    • https://ambalatender.com/upload/files/61491023773.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jo94up6q5kjq3ok308s335rfto/1735846816.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/38471017572.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb054c9b5e---dotogewolesusida.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jomutetevemojapeles.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/15654908482.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/zudiwaraleduniwas.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/73719694762.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/24961726821.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137128c7e1fe---5556078809.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/20070134157.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/nlh46kvnmv0qn745fcvb9jnt76/27181673916.pdfIn PDF document text
    • http://trivio.it/userfiles/files/16885756021.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fe776edf---89408522631.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/20300402978.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lk0ho1dflkbjt66vtpl4alqbj1/20451264003.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/dumifaperu.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/nikujusodo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607594be29364---90755711345.pdfIn PDF document text
    • https://petikdaun.com/contents//files/59038226451.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/47020890215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=anesthesia+for+cesarean+section+pdfPDF 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_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 16796 bytes
SHA-256: dfc090e3b80faafe07eded19ac093b617d501a09fcea0fa16b556f94d96c74b8
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 10652 bytes
SHA-256: b35db6e2dae7bc952428c5b41a3a0db037c0dc4ef24ff80816be5751a3e7255c

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