Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9732af45836d3a…

MALICIOUS

PDF

74.6 KB Created: 2021-07-02 10:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b584d8934eb48e7c2703e8ec0d205563 SHA-1: 3da45d4915d7cadbb562ba96df52f2319dd6340a SHA-256: ba9732af45836d3ab4225678725b5a1ea4e4a812b1a380b77ba932fc9cf096f1
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm its function as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ecole.ru/text/images/file/46424378265.pdf
    • http://kaowei.tw/image/files/20210611_014138.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080321b4aea6---kimanejopu.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb7f0ae4bc---91165100273.pdf
    • https://bititechnika.com/uploads/file/1508072941.pdf
    • https://amrapalispot.com/userfiles/file/12827003775.pdf
    • http://mintaialuminum.com/d/files/2019502166.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d32dc949---xupewexi.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160703b227aaf9---58839797005.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b5f77cca619027743449bb47b0f2242b/fupevosilet.pdf
    • http://mu-rrrc.com/userfiles/file/15542404633.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/35d5bc840707d3f3225fc7524387d9ff/8526609435.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2277d611a---dipebabuvinisudepoji.pdf
    • http://lapenya.cat/imgjovesnaves/file/zojudoz.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc143de325---dotafakex.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a41342e57---nunarod.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/33238f6299c6dcac62a9a23b0e6a2132/87436920264.pdf
    • http://allnatureint.com/userfiles/file/92533197554.pdf
    • http://akinmedikal.com/uploads/file/punodudotasudevawir.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1bv2h99pesc0ipabt26fbcpru/27761440854.pdf
    • http://jedwines.com/cmsCart//upload/file/75886170172.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=commons+at+the+verandas
    • 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_off0000c24f.bin
f752b6b7592dac57c9913a46223f8d317c7ab3071e7cbee778a2e0256f0725fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 16744 bytes
font_01_sfnt_off0000ede5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 16792 bytes
font_02_sfnt_off000105fc.bin
e135340eaa862549ac5b4480da254e4d677e7f44e4fb5c0ba89b5b4af3928162
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10472 bytes