Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1da23f95085399e…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 23:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3d8bbd3f67366447addd49f17134fed SHA-1: c01f5e5911ae65747bbd36672be3321c29559952 SHA-256: f1da23f95085399eb1d2ab18087fd43030c446ad56cdedf21a85ce8c3f9b62d2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to download further malicious payloads. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://derechosenred.org/aym_image/files/devevezuji.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f433551d---32245927085.pdfIn PDF document text
    • http://benly-carson.com/product/files/10467762865.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c790636c650---mozut.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/xusiza.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/bivabofufad.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/bovakatipijokezoxuleliwu.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/44210362603.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/rcmstfnsg3lqudnheb62v7uk3a/wosofozixolofexa.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/nomusumitedixoli.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98de778bc---patorarosikusijaten.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a724f918946---17469239676.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2978e233f0a137e0e130057ba2d36ecd/pefukabupixoje.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/bed5enk03olro6mbintjmaom75/82382261258.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/vomejepigesajofunolidew.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe7b1d2e12---zedoxozumevezumuzike.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/monemutitolavutiketo.pdfIn PDF document text
    • http://billsky.ee/files/file/puvatesex.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/b5njk7fd317rlpeh7m9qcrd63s/kelejusi.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/95137790401.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/rerar.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc0e95ecc---najivenawuvuxularolita.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c35ee744ffb---76594348729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=toefl+essay+writing+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_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 17612 bytes
SHA-256: cefecfd43e9b7211248e8bc084b1043f3c7584f7740e0aa707872022edd6a2af
font_01_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 10836 bytes
SHA-256: 72ee53c9ba892c42327f7a0c0aa9debe181bd09e59273938c3963cdc06da502b

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