Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e5c81bd6f51e84…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 10:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ed453b3fdf7458885034bc05852a6ed SHA-1: 089fa1d0e728c234b308803e89c616c58b95f39c SHA-256: 47e5c81bd6f51e841d6d2b8c3e00e6203e88b0266d0c4b6f63b38f58ba182150
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. While no scripts were explicitly extracted, the presence of multiple external links and the callback lure strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/36510014382.pdf In PDF document text
    • https://etest.vn/app/webroot/uploads/files/17369846366.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/nejujetiminidino.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161364d2e170a9---73568711637.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xobunibekeviseveno.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/getubodorodediwur.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/zibokekikolisufukaku.pdfIn PDF document text
    • http://mousike.it/img_ins/files/purulujaxogaror.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79ae3fe06---70302694592.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/693342402.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/rowedakevejaxup.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614379fb36856---suwawatufajaxekow.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021912333327303.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/vifojab.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477855a5cf5---36796383467.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/55607143944.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b8771f258af95b677601425a64a7f2c4/vemapukixeteku.pdfIn PDF document text
    • http://glassick.com/userfiles/file/28375240324.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210911190513.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/29072751413.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/92973362270.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84508389623.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/233f7e31ef0c0cd49e8f3e2604d14405/21672746223.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420ea786029---xepademalevizawil.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/35835194857.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/fikijepapamoketifexop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+phone+showing+charging+but+battery+percentage+not+increasingPDF 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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 17260 bytes
SHA-256: 33d128af1e3facf215361bd25999ddddfef1198d611340413fb0685bfdefb780
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 11168 bytes
SHA-256: cc93c6f16cda55358067225e9fe2012300ba71f683ad36ed9b7df81f003e55bf

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