Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97f931a7a7fa4d7…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 03:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de46cd30cf3e6184c786094d67648796 SHA-1: c1d28c782586f122c74e48332d613ea9caea93e1 SHA-256: f97f931a7a7fa4d7b22f840ba33c901d6d99e5f07c67e515b7feb1c67ea52b42
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The embedded URLs and the document's structure suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=maven+android+studio PDF link annotation
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/54c04c34a8b80089b623a34076b08db6/fuxapet.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/fonodelagupisotewaxawujal.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/68193927287.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/56053844185.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/sodabow.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/demezawevuvoxalirona.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091523045773499.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/74078704756.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/bikejovirawi.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/25071888486.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/kezokowoli.pdfIn PDF document text
    • https://davaocarrental.com/images/file/14798701947.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/76694481814.pdfIn PDF document text
    • https://anfauglir.com/images/file/22744661509.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/34897210136.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/nejizupelav.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/votunudubo.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kufemag.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/sibexizeb.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/rivikejim.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/14266083100.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lvcrulpsv6v6gvqh22gpi7sps0/famemujureniwageribonita.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161423352cb917---23070046870.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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 10356 bytes
SHA-256: 9b99d73099f2fdb9062683dd37dd7cfc45460a9c18c49f3e6064563d41a49e7a
font_01_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 18172 bytes
SHA-256: 3b908702c1d8dc75f7fa7784203b6be82e288da83883dba1265b7137f8101cb2