Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bb48ee38d51c9a…

MALICIOUS

PDF

96.3 KB Created: 2021-07-25 08:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 896ac27731e32ac957410b684800cd19 SHA-1: 057455216dc9f383ad8d0fc4af8a46f4b5438a47 SHA-256: 56bb48ee38d51c9a917bb4f19f6e66637c3e42bf54d887d9d1bbf949cad3b79a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.alex-vasilkov.ru/images/wisdom/file/46640197208.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a342d230b2c---mokesapizagibejugobe.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e3bdde04334e211a5c4b30943c5ca51f/1687153446.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/govipolekagelonovug.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hhcjsohpnnaltev4jabn6sio0m/17235380735.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/resifiwerowovijo.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082559a4d75d---80220394927.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0742f3dc9dee325b13e47a73bd01d727/12980598050.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/69792535424.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d7e72395---52672474113.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/19664312256.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b498a75a01a---75333077138.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/veludelup.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cdd78eaad948e982453f48ad180cc999/43212448610.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607021faeb419---liserobemamozojup.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/940e1f670df0a3b3a233fd83bdf6d28f/tegewovabijazasujiz.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/piwevubuko.pdfIn PDF document text
    • https://topupdana.com/contents//files/saruwapovuno.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01be3a16a---dalavavalobibonusuxesi.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0b1b624bfcc5ab8f4275d3cf4b5cc19d/7646382860.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/rutidulanoseroduw.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/83178339793.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad25c4aeac8---jategajenomolivogofezuwuw.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/xifiwulag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+lean+6+sigma+black+beltPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 20096 bytes
SHA-256: de6c1e9336fda7b6799cebac0e0be61e1cf05f43cad422f3969d5c787c14ab9d
font_02_sfnt_off000157ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CE 10848 bytes
SHA-256: ea28cbb59939d74b00f5d15561999640c25f01456b0446eec8af026c99d2df60

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