Malicious PDF — malware analysis report

Static analysis result for SHA-256 398c87c2237ccf19…

MALICIOUS

PDF

111.7 KB Created: 2021-07-13 23:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e5f492a156dff468fa2705f2c8b7108 SHA-1: 5f720fbd25d34c24baeb153121e200e8dd38b144 SHA-256: 398c87c2237ccf195acac4d176705e39d583c4bc192bc3efa0417515a62d804a
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 compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://pinturasoltra.com/images/slider/files/vonubupiwokufaramavuja.pdf
    • http://brkvinc.com/userfiles/file/44635359251.pdf
    • http://nesemlak.com/test/images/uploads/files/wupositoxef.pdf
    • http://rogo-rotterdam.nl/files/78207684745.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/97ed2e150da04cf20d20f134f00548c2/tunuvizosifazumobeg.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0600163d---wiwajofuku.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a039ce89ffd---28822697987.pdf
    • https://pacpartner.net/images_client//imagesfile/wubusemowegoseba.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8a9275eb---pikadud.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dbd2567bb422a4037d0b00d84b4b1db4/zobanasebi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/00b1e15ae40df1a84a48f95f3c36ae4c/16670190400.pdf
    • http://armanetti.com/images/97027898097.pdf
    • http://nexxosrealty.com/userfiles/files/29552549193.pdf
    • https://oddluzanie.net/userfiles/file/boriredemularagotimo.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rabafakurokoganepelug.pdf
    • http://selfmadefilms.nl/userfiles/files/mosisogonidifumonemepir.pdf
    • https://accuratesearch.com/userfiles/file/2035777628.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607259085adb0---nanilenofopigifopifaro.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5861a3e4db048a24fd9a5866c77fd5d7/46815525127.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc13b836be---29838092912.pdf
    • http://www.abcklima.hu//data/editorfile/19758717019.pdf
    • http://gilendor.cz/userfiles/file/45798914155.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160818547763db---likiti.pdf
    • http://spc1991.com/ckfinder/userfiles/files/veletotemax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=two+step+process+of+attribution
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000144f5.bin
86847ef98ab649884ae8502dc71f65961d97d1343b1c391fb97f82852aa7e75b
pdf-font-stream PDF embedded font (sfnt) at offset 0x144F5 17716 bytes
font_01_sfnt_off0001739f.bin
a8607d2a81cdfda56a03a866dbf15d43ffb8a3c9c9ec599dfd8005c18ed08efb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1739F 10716 bytes
font_02_sfnt_off00018c36.bin
c971a763947c63488f448593e40ee8c7b852e12a96bd75f093c8c20a18407fc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18C36 3076 bytes
font_03_sfnt_off000198d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x198D3 16792 bytes