Malicious PDF — malware analysis report

Static analysis result for SHA-256 928483c39bc6e14d…

MALICIOUS

PDF

90.4 KB Created: 2021-08-24 07:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b769c27fc3ce858007437c426b7e217 SHA-1: 981cda9369efadd79737430b26d55c0c97f77260 SHA-256: 928483c39bc6e14d5ec17286a631b9172c306d7c8f4dc0a424490d0e18a53663
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which point to compromised WordPress installations and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to download further malicious content. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://nowyhotelik.pl/userfiles/file/lawokepata.pdf In PDF document text
    • http://fygl.net/uploads/file/210858098444.pdfIn PDF document text
    • http://ropesadventure.com/d/files/bobesuwafop.pdfIn PDF document text
    • http://benly-carson.com/product/files/53001390282.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5noqm3hliuvgo91t9bf4i85vd6/5353361599.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160783a73ee79f---xunigolapizugezenuma.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/77790687648.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50ae73d27d---dafazinafok.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/giwejujewadaliz.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/wusif.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8d2d3c4085846b116e3924e2faceaf30/48872982754.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/12708112872.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zomorunurizelavitefawed.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/bepakodojuzanadavufasax.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/47380172642.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/wurewepefukorumurumaxezem.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/59653909852.pdfIn PDF document text
    • https://agatanorek.com/files/file/jopeputafowetexuvebuk.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fd9cf345bffa8d1c2466cb962f2c91fb/fojexusawifoxoxufimepil.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161049164d197d---17823906569.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/jiluwajejaxanatimiv.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/34786981654.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/solopokabulufosi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ceb6f266---42631855550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+a+powerful+tnt+cannon+in+minecraftPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 18348 bytes
SHA-256: 5bb8f31fb8567b977dfff096a6357bfdfbe8bd2056812e7b6953294ab2f96334
font_02_sfnt_off000129f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 10744 bytes
SHA-256: 3fcc05f171dd652eb1f89fdc8aa93eeb56b70fe3b6adbda181a7276064b6c6e6
font_03_sfnt_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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