Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2c8d19575e9a34…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 17:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eac19831acb1e1f132d6d66567797814 SHA-1: 1160921e2a627f1bae6ee89507bad3c114e992d0 SHA-256: 9d2c8d19575e9a34ede50f3405176c697074bd6510c74d9b6da29cbfc9269881
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://orchid-daikanyama.com/userfiles/file/66356344266.pdf
    • http://musikpark-live.de/userfiles/file/jevisulelutapufaropito.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6fa8cc6b9723b6e8b5bc528a654b556e/xexojisex.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d5c9cdd8---kefanalupazobeba.pdf
    • http://helder-effect.nl/userfiles/file/pulipawibajotimetiwemolet.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f644fdfdac890694cb7c6534d1d173b/95068213580.pdf
    • http://energo-winstal.pl/userfiles/file/genesagikoge.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e67b943e4---92211207221.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061720282573499.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2651502413---2668115881.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4533bb3fb---fafedifabapodenoxaxuxawa.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716c9f839de---javakofolatibulaxukozib.pdf
    • http://hotelclinton.it/userfiles/files/xapanap.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0d219164b2de9c606cb2a9789e9b54f6/kivazuje.pdf
    • https://cafepiolho.com/uploads/assets/vomarutulixitasonal.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/un96dd7oug05chsthdakvbamj6/noluwunudanemuxa.pdf
    • http://www.prieteniitehnicii.ro/documente/file/80916678260.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/zijowanelixoranabepogined.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876353b634b---42291627828.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9782ddf4a75f6453a97e04fa15ed7694/vutikagijovoris.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/rerilutefurita.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6saoridni0alub2a02lm1tr1o3/xusirijinezajelu.pdf
    • http://nedirajtebosnu.net/userfiles/file/6813265105.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=25+years+of+love+and+togetherness
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b4.bin
12ae8fe1ee4bc6690604bf0a2e9073de79562ba541e3413ea17bdd9923a91347
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 17376 bytes
font_01_sfnt_off0001242e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
font_02_sfnt_off00013c45.bin
05227051a4df569271f5b35cf99ca59b75b2748b03a47f2c50329127bdf5dbd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 10880 bytes