Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55dc5562216131a…

MALICIOUS

PDF

88.8 KB Created: 2021-09-11 08:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9630f71c8b2f0e87ff703cbe1592d595 SHA-1: 1033445ef825491a63ef0edc5235c40ad5ec38bd SHA-256: e55dc5562216131a42069cde1effe5b8fe29689c4cfede7f3df6ac1ff6286f72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating a compromised PDF. It contains embedded JavaScript and a significant number of external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=voice+changer+mod+pro PDF link annotation
    • http://laser-piskovani.cz/democms/userfiles/file/40399252346.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/59540103089.pdfIn PDF document text
    • http://coolscape.info/images/files/76703122337.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f590df36---dupanelewogekekugo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/86123261ab2979189f2874a42c281eb7/jojomu.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/77022941206.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/pogabavoxefo.pdfIn PDF document text
    • https://samowar.ch/upload/file/37767993440.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/071420562533.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/vaxezu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136e223b7592---28953752964.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/16009919530.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/kukikagonedema.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133369bc0999---wamigesojibarukab.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/84751477445.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/39631354710.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/78286871779.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130c36c56dfc---48796067220.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/89345995736.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161377f288df57---50867007191.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/mefemosafemufibafot.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/54550813445.pdfIn PDF document text
    • http://bwc.lt/i/66918189986.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 23504 bytes
SHA-256: 8924467cc950cfd7ca9c26e40b282fd99712c8e42655a3a6beebade066ec17c9
font_01_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 10616 bytes
SHA-256: 20c0961e3e519e9437338314c71a66773b03ccc0f3f708b0952e20b5929d73d7
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16584 bytes
SHA-256: 62f3901bb479844fcba286d45286de446303870b1876fe0ac014b4359b1d99b1
font_03_sfnt_off00013d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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