Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc531594496dd0d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 02:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22dd2f8d96b70f6f1ffddaba0c3b9938 SHA-1: 805b2c8e18ef39cfdccae41b80da87f012486eba SHA-256: 8fc531594496dd0d6ca9c2b55c2707f1c8213ce1380b98b11ad19f2597de1fdd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f4320ba77861d8e61055ef3ead544e03/mojukelinisolevivotu.pdf In PDF document text
    • http://chrislahoda.ca/userfiles/file/bugirojavejawofatax.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/sonuwipejudalemurut.pdfIn PDF document text
    • https://bdata.vn/upload/files/73685400164.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bb1c623626be4e262f999f5368d3977b/90843400815.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/razexijevogiru.pdfIn PDF document text
    • http://tulga.ru/editor/files/58451633109.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/85633054614.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/68822000491.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/junesafiruvezod.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r569e0k0hu3ar83r91od0fjgc0/65941651943.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/45b9d6255c06f32c5b8fe0eb44455efb/genajopozejazomedetoxaxe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16112985c62677---fuvanavatajodokud.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/lolaxonisi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c95e0dc84d61a7699c14d0bb3cbd60ae/56125497877.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/8975579456.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/gegiviwezavosanavin.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/38414211140.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a8a58616c---80532594000.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/69210144779.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/sazoxoxus.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/18001878530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=marshall+woburn+bluetooth+speaker+manualPDF 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_off0000bb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 10836 bytes
SHA-256: 156c0096ab982235f0143dfea1560fecf8ea83b094911c53ed7113c45e3bb4e3
font_02_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 17300 bytes
SHA-256: f964047824a88e70488e993294bc1cd49712ac9490849fb586de28d1c73a0dd0

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