Malicious PDF — malware analysis report

Static analysis result for SHA-256 add728f216860f9a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 10:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 328f9634b641730ada66bda2bfd0594d SHA-1: 55e8b70f36e153664e053dfd738812847f07c78f SHA-256: add728f216860f9a9f6d2f144ccda30c0c5e2e766730aeebe856af163d9e183e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further compromise or fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://miet.hu/kepek/57607839930.pdf In PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sarusifotufuzowolebopo.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/84426642470.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/nivagexaxaxi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1ba44b134322bf4dd68e9bc7767c41b0/22347627611.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/lorotekumepowuvubije.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202108171237309933.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4a514d2fe869f4dfb54b3558ee7e417e/97292012573.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/93568256449.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/ritixekato.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/bitofonufanagodobulun.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/50507119425.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/garewazotigexetezawukatel.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/somekinofadedizataki.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/divumoduxijetigok.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda7068db3---fatibu.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/37038720731.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/60011457726.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/39578246887.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092044d2c5be---37209498254.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/517037c9fa27d75da814ada5af30bbf5/20778597917.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/96092542779.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/98075930662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=d%26d+dungeon+master%27s+guide+4e+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_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 21620 bytes
SHA-256: 5f008688de3fa376db43f28da1f21aa3965bf48a2756f3611c22f8cc0ffec508
font_01_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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