Malicious PDF — malware analysis report

Static analysis result for SHA-256 6508a2a6aa8772c6…

MALICIOUS

PDF

80.9 KB Created: 2021-07-29 17:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0433089a23eb736119c32c4f6390bb16 SHA-1: 5b9fa2124bf5b1f9b0cb355d53a3010fce7dd06a SHA-256: 6508a2a6aa8772c6c29a6a13c4b71479fa75c4f31a55d3947af314f42b2169c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://asupuro.com/user_data/image//file/sexaku.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ff66ec597ee---medodeb.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4f2babf4467110a82d0b9e55f9147f16/2691055573.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5983e5f764---97664917544.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b050bc55f---40993858293.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e6ada490---fejovafumojavoliwivo.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4089f4d9bfa8c1c46af3d40eafebc7ca/xesivefokolapeloregi.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/babokefugil.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/zifafanumeri.pdfIn PDF document text
    • http://ping-property.com/user_img/files/42292275166.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/69104332960.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/betogofewazidazi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160885c93111f5---murugomixubemalizibimixub.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/84t79u1i7kfr5j17pvmun867f8/digusexe.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pefibadatagemozi.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/18744882336.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/girezubo.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/86862914002.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/kexepeluk.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983e3acd6bc---fugitul.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/89097770430.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/80539393618.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5246271124---bumusutejexadesavimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=why+is+my+elgato+blinking+redPDF 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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 16568 bytes
SHA-256: 20a1792eb37273dcaf2ebeb3ae09fca49c4c31ff2bc9ee326043c3f83920d37b
font_01_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 11032 bytes
SHA-256: 9bd91a25708b9bdf10ed1b512e1a36f5759d4d7043ab8f59c4f583effc75dc8d