Malicious PDF — malware analysis report

Static analysis result for SHA-256 612a872ebc6b628b…

MALICIOUS

PDF

140.7 KB Created: 2021-07-02 10:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c2bdf3164e19c739768f925b30285a13 SHA-1: b65bfaef15352007b0ae1a6c0b14199055d3ed59 SHA-256: 612a872ebc6b628bb76252093b2cfd947d09871f4bd22b69d81f7405eeef1e6b
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting upload directories. These links likely serve as a distribution point for further malicious content, such as other PDFs or executables. The ML classifier strongly indicates malicious intent, and the presence of link farms on disposable hosting further supports a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=pdf+auto+open+after+download PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8kitc8bkh1t2s1qp630g3l93t3/legisufefexerabisisiv.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/4820887736.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84c24f4e1---jiwowadadafusurajibub.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cc2898720---11887067235.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085256bae10c---73107635790.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ea4e356b22200de7631817ca321ddb5c/xapogagek.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9ce5ba85---sawodefufatiri.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e4b9654b354f81f7831dd4828893e27/66315096303.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2f71c1954564eba2a7547847c9e6be95/40599271152.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c276f6b4c13---70819317977.pdfIn PDF document text
    • http://2440027.ru/upload/file/80549348706.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/56b940cb1edbdcf5be8a925533b2dce2/fatimax.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/64999373414.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/xiguzujigowupabeju.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8scrfrt9jjvr8h1pp0kbvdpahv/pidogubirukajebofaverire.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/67356045792.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4913a683bc93b9f113489363c7efa710/pisimi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l8b8uuva28npotprqg4bbrdvj7/kibutojubozifosunopop.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/49626129829.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9863a8aaad---dododa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec00a5e8bc---fapiwasixezeni.pdfIn PDF document text
    • http://synowka.pl/galeria/file/juvufarig.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/967621437b46e0052baf6ca352771383/biges.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5246cee7bb8f3afae867b94e875fea2/92563371923.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_off0001c56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD81 10416 bytes
SHA-256: 93e53bfc91dc53824b57b11da52612c1c2e0fd3f0d7cc7fdaf0ce0667bd1662b
font_02_sfnt_off0001f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F54C 18332 bytes
SHA-256: 784072adb3af6f9656ec072973cefca7e6e91d7649818c9637156acc06daf5bf

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