Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e83019b6a42642…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 12:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 109a8ea4f528a3891762e2f3e67c7522 SHA-1: d6bb5ece204ef0acb3129fbc04421d8fd1bbc263 SHA-256: 93e83019b6a42642d758a458ab72f6a212edb96b4e50531f3ec6b1d98d67d7ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scamming operation, potentially leveraging compromised websites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://atasuorganiktarim.com/upload/ckfinder/files/fidefanujorabukave.pdf In PDF document text
    • http://orderleesushi.com/uploads/files/56672381265.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/58459721754.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gujiferosukulesiroladi.pdfIn PDF document text
    • http://iphysiology.ru/upload/45351499004.pdfIn PDF document text
    • http://slovoveri.org/userfiles/pozezaxajabopowi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///matag.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/6188411754.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/zagowefezibasapeja.pdfIn PDF document text
    • https://geloracinta.com/contents/files/72345528195.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/80803085625.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613829887cfa6---35889245452.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/bbba2817bd457984d96902bc8383d475/48233324581.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/tulojabarodenezesisa.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/73018286494.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c0b562b1d45aa313509cef8f91c60d86/24268203836.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908232443.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/gezobojet.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/18752201505.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/suvut.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/fifatazapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mod+hide+and+seekPDF 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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 10188 bytes
SHA-256: 752ee8f02bd3c57e7b27e56f8099d983b91f7b7fc1ffa5cd519649473088473c
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 17344 bytes
SHA-256: c051b509bf164d865783c710508854b7618a23f38c108bbd044b03ca03df68b2
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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