Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c164f3cec49392…

MALICIOUS

PDF

133.4 KB Created: 2021-06-25 14:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 491482c5230b16703b85d8ea4d978dd8 SHA-1: d4ffff2ceb0b3c35fc193ab07193c3ff5a43d41b SHA-256: e1c164f3cec493921c59967bad636dc8a92471e07e66c27f415b68fbab1e0a7c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics flagging it as a link farm on potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=montelukast+and+theophylline PDF link annotation
    • http://ukrainski-rosyjski.pl/userfiles/file/34581519444.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/puvix.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/18270637175.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2b784d00be68fafe2f4bfc9c8447289a/nusixibemo.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/gibojimekifek.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/mmb47pkpaha64vpl1m4r8rhms1/panujujivi.pdfIn PDF document text
    • https://ahha.az/userfiles/file/86610301365.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/85412510046.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d758468487---niwibosufi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32366396c---65319042595.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/98385423240.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160945f80b55a8---zoginutegufurolej.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/82001310488.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607427c4ee17e---42706657458.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2fb3f57b---saleroga.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/sovulomagibekobijanixi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/73334b485761b87887a88c344dc6e880/83646498467.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/jawuwubalebebixune.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13687 30976 bytes
SHA-256: f85d0ae3c553dbaba668749f331c5576aaf555467e0c3d7b4da3d24958de2a6b
font_01_sfnt_off00018a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A24 20432 bytes
SHA-256: b0478e6e34e9d5dc7b3b4e68304e2134e663ba18815ff89d003e9a906acf2693
font_02_sfnt_off0001bec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6DE 10688 bytes
SHA-256: 985d0fd9addbd43f1f76170b72a23c8bc94c3fb2144cb3e355e3482bb1fc553e
font_04_sfnt_off0001ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF52 16160 bytes
SHA-256: 61893c6f5a4ed8be90b59e62ba5f7845fe3f782be61d2927f64273611613f2a4

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