Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28cc7e32355bf2c…

MALICIOUS

PDF

88.1 KB Created: 2021-09-20 09:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13a354bde2d3f77d257b540638c68473 SHA-1: b1159dbb841bebf0475a2fd62a7562f1d67efed0 SHA-256: c28cc7e32355bf2c3213863903fc81136c614a479d309c07b26f9e4328f7ef7b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or tech-support scam pretext, aiming to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://vietnaminsight.biz/ckfinder/userfiles/files/58165116919.pdf In PDF document text
    • http://thebankcardservices.com/uploads/files/gowajiwilademeludak.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/70126637636.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/gopubapagasidedifugela.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b925a5a5e---21868176724.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/36141811828.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/42081533144.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3bc4slh6a4902lhqkovaef70se/89062129109.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/jubidivowojunuvavizomenug.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/xalegumitejuwapidor.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/07352e67f2cbdd1e1cdf7a15de39c565/15562258720.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/gokibasisu.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/jigijufazefexo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c4rftf9lfaal46jecm11qj1as6/68451947093.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134d84da1dbc---sebibomabapix.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/susibamonalasato.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/bokevosuvokifaseno.pdfIn PDF document text
    • https://ewt.cz/res/file/95756383852.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ea116be0736d9085c821e017efb080c8/84337144955.pdfIn PDF document text
    • https://zzhqhi.com/d/files/povemupovorodezofemivadez.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/xexowika.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/17342089077.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/53263371114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hanuman+chalisa+in+bengali+scriptPDF 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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 10932 bytes
SHA-256: 0926748fb37d8390fa7af47e77170f03a81db2def72bb0ea5eb7f5b1420fe329
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 22696 bytes
SHA-256: d29fb135a451123731079fa2ebf958ceadfb1405255d376186f7c748e88af586
font_02_sfnt_off00013aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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