Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af9551db15b1644…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c119b03d6ad16ab8ce3fb2722d6cfa13 SHA-1: 99113296a640738ac30105bda8afb34aefe79a2f SHA-256: 6af9551db15b16447bab066ed845f60944c1c3365506ee8b7fc8b57539864e8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pretext. While no scripts were directly extracted, the ML classifier and ClamAV detection point to malicious intent, likely involving the embedded URLs to deliver a payload or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161424e93be18b---fekob.pdf In PDF document text
    • http://abwingsmd.com/uploads/files/85889412385.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///51292100549.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/28198703506.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/557378a0ac76387b600f84ee5a0f53aa/joviwexipuxifelodizawazov.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210902192244.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/pugagifajakem.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/45065692168.pdfIn PDF document text
    • https://slotpt2.com/contents/files/76178459848.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3da63dabd---34866871175.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/sidasonaduzivuxamaxoz.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/denumajud.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/95199140081.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/uj7po4gpvurukd89qihe7fbsoh/rikuvasuvod.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210915_211516.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/fenuturenumidezuxigidijuw.pdfIn PDF document text
    • http://p-energo.ru/content/file/fizal.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/92561727920.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/27094641792.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/52167490669.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/23436081039.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/makinevowamomimapojefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=genki+3rd+edition+workbook+answer+key+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_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 20576 bytes
SHA-256: 25dfcd41bcdc39a6e3ce78f6d83681d8e5e177367597888bf8815c92ae8d324a
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 11088 bytes
SHA-256: b553b968c58fcfa8e836074eabc36e69a23ac1dac3b490fe35763d82aa37fc27

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