Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca7f20c745a16a4…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 01:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf60bdde7cead2fcb58c09d0e17643e7 SHA-1: c2c7ae88ac9073b2cf3c70c2a9052aebaf35902e SHA-256: cca7f20c745a16a4f80d7fab0255b74c2e3d2b63c57ce20d9e4897fee160b641
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is weaponized to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91af2496e---kogitomedumawigudivegav.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/9e77d9e9f2d3517fe1a3a08d59b36f1b/41865152548.pdf
    • http://akcjonariusz.com/UserFiles/file/70378625701.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/13kh5f2du8hf4avnrn3tsl9jic/29401118185.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b57fdd76db1cd46d20471784a52e845/rexipuwamusadedozubibidi.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb6c7b29b---tozawolubarusax.pdf
    • http://www.contectrade.hu/fckfiles/file/90340005499.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ej2noiv4e3ebpvpgmu0qgaj7ic/80195780317.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3df79a011b---32843739705.pdf
    • https://attack.lt/images/files/sotetipofuriwidetolarefom.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jjnmi1a76otbh332bptimsc154/togika.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872098495c6---98463186496.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/d3tft8nf93b3ksfd2snk28r99d/4768649118.pdf
    • http://acecaalcoy.com/userfiles/file/50122905606.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a102e6806ae52d7983ecae380d3b4cf9/lafesa.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a97b8783fcf6b7afe98e3a3030c44941/wagura.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/wujajageludamixej.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8da8c66ce---89560780620.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/a8lb2n06mpf6saji29tv0t2te4/lafefepivovom.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279755ea0c---84758967407.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608420431d66c---gafaleveferaxelejabudogit.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/48b2dbc557eef54cb151527e926b5b7e/sobep.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/29341404361.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c120e23675---38176163061.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813598e91c3---gebemoma.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fractions+problems+for+class+4
    • 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_off000100ec.bin
409ef5821b4371ee93af3bb2c971b668b01a0c9c03d486e337d3a51c1efb2e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 10836 bytes
font_01_sfnt_off000119bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 16792 bytes
font_02_sfnt_off000131cf.bin
6b419bfc748dd2a6e012343c3ce5978821a3f0edda293fe3800cf62dbb8b4dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131CF 17692 bytes

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