Malicious PDF — malware analysis report

Static analysis result for SHA-256 780287dad3129b66…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 09:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a915730c81e33dc3f0460d4eb9bc8c22 SHA-1: 27a4f431b87dfb78c221675ce3f86b4bdbecfb32 SHA-256: 780287dad3129b664fc0983bea61cdfc358f570c1dfee28e8e682a7f0983b95d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests the PDF is designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897820eb776---15651758189.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/n7g71qpa97nq88l62b3jbaqpeq/lefepeb.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f68fded---75520621985.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/mqu0n0s4h6i78dgeqboi1mjtm5/38487228.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/np0nqhp36hfe6tdvbh93fh0f32/71284277029.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607157f29e248---38025515851.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cf166c2d---93889361930.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdaabc8f46---9167493301.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/kabipabemi.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8935049404da6cf39270ea2d5f974159/zibubeboz.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s3v9a7ffmv2fu15462g1dt6ta9/61442196475.pdf
    • http://chi-kara.net/userfiles/file/20389911476.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d62220c571b---posewezugelijizirajumis.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb51bacb7426e20db036316c1fdb0e37/pidobijororepegetesuz.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d678ad22e---64002831669.pdf
    • https://abe-rdc.com/userfiles/file/10612293958.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f88d99e057a926194a7c91509bb85f90/58192099570.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/888395480e1eb0ad15cc59cb885758f8/28889967201.pdf
    • https://efsanepin.com/calisma2/files/uploads/lerifemalabexetefoz.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df728cb860---narojifesunolusiwumudav.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca801b1f59---83883822728.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9a4128e624188f9e68e093f3dd9511ba/26157965299.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=example+of+ppp+lesson+plan
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/17ea03ee350b3b201ffb5a8a91ca5a3b/masumazikedumidu.pdf
    • 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_off0000f482.bin
160c4429b1e5a47403ff947f4a24882bb765d766e0d816872444cd1298d93fc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 10312 bytes
font_01_sfnt_off00010bc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 16792 bytes
font_02_sfnt_off000123d5.bin
9a1b44f642c44c26c35c5310a31408d3c7247c7dc3e60039b8bd54546e9e1fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 16912 bytes