Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f37baa39b645c19…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 23:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d6829bb3e9fdf866919377c679a03fe SHA-1: 491cee4c77e094b1ede2f1c6e88710780d5dd2c3 SHA-256: 3f37baa39b645c196564e1bf784a0c5634aae73e973ab5c0d4232a052cff8648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=us+improvised+munitions+handbook+pdf PDF link annotation
    • https://cncostruzioni.com/userfiles/file/rozogil.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/watilenodab.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/7093350427.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/78720177413.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/jigexabelapexopo.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084599e8211c---lojudanoj.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jpndvqauops99e4pc9cvd9mog2/damoge.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb8c4b7ae---suvagapepibuwatilan.pdfIn PDF document text
    • https://j26clean.com/upload/files/39212206979.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ccfd888310323f2e9b91b8d49c52cb9d/pevamewunakamakokovedu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaac1d8780---dizarukapajafuvodikijet.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/medebidilowewogagewujunuw.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/tuwujedidogarabibax.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/lazomeviz.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb539eff78---87955718513.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210719233220_1807351561.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/27778750852.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/87721890856.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/kotapamosorosetiva.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cb9511029c152cfc847136ca62d291f9/bawonidiwuvevomimezigo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dd0b00b6683525bb71da10a2d3e4d2f0/21163820156.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/5144897831.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/92275269672.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/38202a72104aad3e9fc1cd239c1bc894/nububod.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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 16732 bytes
SHA-256: 8619fb2419cd1e95c7a276422ff134d10ee1da5a69ad6c0bfbd64f1cb15c1a8a
font_02_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 11124 bytes
SHA-256: 26866abf20786983fd1a81bceabb68bfcb7b12a41cc6597c65c0a0c3c22acab1

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