Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb3b5bed4a38a84…

MALICIOUS

PDF

126.1 KB Created: 2021-06-26 23:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cacecc3d89856c45be30ca0f4fd82a30 SHA-1: 7cf0bc666a0fc3680f807bfe1a2ff4073d27b243 SHA-256: 3fb3b5bed4a38a84726985762e2fc6564334a913be4efb47599d539cc2b95e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, indicating a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92cd5afe13---20625281096.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/969107b01f2a537b307a6db2195ca57b/widolovijujetimobutazeguk.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/362159fff933f874ddbe7a578886bb82/94783778449.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/lolef.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/18195895376.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/15367506603.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa71a9c8c---gumamemuraxev.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08764bc7e---83230055479.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/25131718974.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b836e35b72152135d828a83c79d2353a/83934133643.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079553d7f1bc---sokajuka.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9808ba24b---wigolukabuvop.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/fogevobukon.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6f31ebba---51558615988.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6e5143e3383cb7574cba2b42bb23ca2c/22965051087.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/jovejebagodowudu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/bd8c20e5541900b9acaccb0b3a3c9fdd/wizinuvinotokoge.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7c319414---ritiwasamobuzovojigobe.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/26a3a62b7211ac847e04239e39f7e81d/lokeberab.pdfIn PDF document text
    • http://atomleasing.ru/media/File/doxikababeru.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/lewodiwirajezasanod.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae108362a3---95603512909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+many+letters+does+the+filipino+alphabet+havePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A96 16584 bytes
SHA-256: 2f141c7fca8296a44c0ac4a6eb762bafb5547707233e05014cc9f732c9d89bf1
font_01_sfnt_off000181da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000199f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199F1 11160 bytes
SHA-256: 07513b806d7c72a0e1c88e3e317a857a385f2e693211cd8fcfc1bee55e6c31b9
font_03_sfnt_off0001b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B390 21116 bytes
SHA-256: 660d74b00033a25b2096188568e3409ad5da85ca02cedcd2f797b08d200a521d

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