Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cb0077e679cd7b…

MALICIOUS

PDF

94.8 KB Created: 2021-07-14 02:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c0fef4aa2e912aca22e2db07e3aa0a7 SHA-1: 2977aeb617ac744e156f582518c6d51fd51824be SHA-256: 69cb0077e679cd7b2a2b2328970a69ac88d47da0d1918cb3f52442e8053dd80b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm or redirection scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825a4db2b9f---jidulefapedisus.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b844a6cb---10862300210.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607caac90a590---57361512296.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4ia227u55gj3n5re1n6h5fnhem/nazodipuxaka.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ae2705908814fba339c1c878b6b67f3c/9538263909.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/muukif5eck20582bocg0cudru1/kalodujakob.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d87367cbf---mafikomasatunezatuz.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/fadaketikesadomekomowapo.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/92222289325.pdf
    • http://beergolfers.com/blog/images/file/xakosunufiladerepemexiloj.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1491393bc---tobixotok.pdf
    • http://bodegaadrover.com/userfiles//imagenes/55435524376.pdf
    • https://ceccarbotosani.ro/userfiles/file/26458579761.pdf
    • http://web68s.com/upload/files/zunugarorojofimej.pdf
    • https://bettyloupaints.com/userfiles/files/37799391731.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/57709069756.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99787182119.pdf
    • http://vds-construct.pl/userfiles/file/xisepogixa.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/c3gpeqtki4rkemclg8kiina5jm/zajipozixaviveropukuzoji.pdf
    • https://my-natural-style.net/upload/files/gobuwexogugofejiv.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rfes42f6qvhb13gfe8uh4cgv35/20304066622.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6cc9a38a---37038216894.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f3d89bbc1202d9e1c0f77d32488a2564/pazuratisobujuso.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dee927985bf---tatopisujupogegofefa.pdf
    • http://mfahk.com/upload/files/87458036212.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5255ba3f---difarubojarazelolibapasow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+analogy+of+the+user+in+hci+is+used+as
    • 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_off00010cbd.bin
d89818db652b47074344f398ede6d52b038c158b98d473d76c4fe1f39902d88c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 18408 bytes
font_01_sfnt_off00013c83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C83 16792 bytes
font_02_sfnt_off0001549a.bin
dfdec825e41bfde0fe283a41553cf4d96bb70378f6a3ad5fdb7fbbf915318e0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1549A 10932 bytes