Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ceaffae8e22706…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 02:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d88972da239e74f73c417b8758cfa44f SHA-1: 28a87bfe73ac6a223bdbfeec9ca78c67acdbfe4c SHA-256: a4ceaffae8e2270685175f190ac32135f5dfd26f3888b09c08b05c41d920a6ef
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to external content. The presence of multiple PDF link farm heuristics strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://gppacdatabase.net/userfiles/file/fuwesugaxeroputixawab.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161334c1319845---kaputusatatomineguvaj.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/takoninasi.pdfIn PDF document text
    • https://csodamalom.hu/files/files/50928914484.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/84673601713.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/boboganovonekaxebuf.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/widagixanaberelegijerijab.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/pugidosuvokewob.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/97640227473.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/50873019053.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/jasav.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/47767601850.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0de80588---43127599632.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b59f3d05cc0016ba0531913625522d9a/5572477597.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dilobepuxalozezewu.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/davekofalor.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/wafivamedinepuraj.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/bonaf.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/42459276010.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nomamafiminav.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/7690941390.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ab0a8a6202643371e0be89d1138cd4d9/tuxokirozopevuton.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/51791693210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=garry%27s+mod+download+free+32+bitPDF 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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 18612 bytes
SHA-256: 148dbaf293eeab9b7832705fb1b82f251fb302a42a3bb04d5444ce3d1e688e26
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 11220 bytes
SHA-256: 19552ff7110ab89fe5a86776c7c3b1a1f899e8ced0c703b4825bb11b4f421f2a
font_02_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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