Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b3bb74b6ffc1bd…

MALICIOUS

PDF

82.1 KB Created: 2021-10-06 01:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03f80128a43c52498777e3ad9297006f SHA-1: 502b860547c667e14b7f0d035458f7c234218bfd SHA-256: f5b3bb74b6ffc1bda284a9f53309b86e1f426e644c2ce4e20c23638cd113cef8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=counting+numbers+worksheets+pdf PDF link annotation
    • http://testplanet.nl/uploads/files/90975015795.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/2229625892.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/97619234789.pdfIn PDF document text
    • https://arerp.kr/data/file///gonunosaxopefole.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/masakug.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/90084334061.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/30e5790f9d3f95e1571a6417e8fe3ed4.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/dogidelepapezab.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/zasoritodamisilagipapes.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/57826555606.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/12527005684.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161496075b49e0---69768688931.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1df8e0f4---palovi.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/32726465368.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/97368213001.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/rejorolojomil.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/sowoxugasalibuxe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f955423517---nikizerenimejugujezugotus.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8b2a1997a---debuguwekapuniwer.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/86821244616.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908012324.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wodigupu.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/38574688534.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/xofovevizevanukugikokami.pdfIn PDF document text
    • https://lapdonline.org/file/fifawazapidipavosiwa.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 18168 bytes
SHA-256: fb1aaa72f69c394b97ebe9da6f2e297d32562914dcc815d1e6516f67700f86d9
font_01_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 11188 bytes
SHA-256: 0865294fb456a33522dedf2f1f10a414fc2a7a8b67c76b00a87b352f21ac2baf

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