Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56ffe63845734d0…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 01:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a672725742e0dbf39e2960a2bddbf3d SHA-1: 6f487356d37bceba91c51412d53ed2bf77459ce4 SHA-256: b56ffe63845734d0212203d808328acab5685b908df080db14f54a233693af2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to redirect users to harmful content. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution lure.

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 https://nomylo.ru/uplcv?utm_term=streaming+fear+the+walking+dead+season+6 PDF link annotation
    • http://ronaldtan.nl/images/photo/51486844389.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/14649872277.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/tujuxalakodu.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/79368972005.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a4a37c862---dusixega.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5234306130.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/af5e17129ae5aace491be207b2dea197/18573920299.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/40064035598.pdfIn PDF document text
    • https://italvaping.com/file/sivutasuboku.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/kegiwomumunaduneponigan.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/53452725529.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/5926793603.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/91528667789.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fabc81a7f---8150139801.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d6199d1f30c14335ec77230dffb74692/sotamariv.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/wifuzavobibegagameje.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/98913665624.pdfIn PDF document text
    • http://compsult.net/userfiles/file/sexufatipal.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/femasa.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/renebupojivugupikabawaf.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/gujavomipemunuzovo.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/67641337962.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 11224 bytes
SHA-256: 0f97802f961623b74da0bf83e705bf2ef04b6d95e967004260d51907adea4fad
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 17652 bytes
SHA-256: 94252feac883c4e6ce41dada350404eab821623b7d3209e4d4a5944011ce3be3

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