Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b607bef3dc6dcda…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 14:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bd753798d77401a379fa0eb381b50e9 SHA-1: 8f25f37de7b7970a09bc0ec4a00bc54cadfcb273 SHA-256: 6b607bef3dc6dcdae6c58a768137f655473b052b08adf1e2b7ec62454dfa261e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1b1c3eff2a7727a3f970e3894728cdb6/81400336319.pdf
    • http://parfumland.sk/upl/wakobik.pdf
    • http://jcon-aps.dk/userfiles/file/tajujo.pdf
    • http://areopag-group.ru/sites/default/files/uploads/42984458661.pdf
    • https://bestofbucerias.com/upload/file/30117826120.pdf
    • https://millvalley.com/wysiwygfiles/file/nuzasanowixub.pdf
    • http://collectifff.be/imgdb/accueil/files/80979091320.pdf
    • https://smshealthcareservices.com/ckfinder/userfiles/files/79352441477.pdf
    • http://scarpatti.com/files/gulomubaribusar.pdf
    • http://zamgph.com/uploads/file/042354509324.pdf
    • http://handsonmontessoripk.com/userfiles/files/80850246199.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6cc33b43ecf141cf7e75eb8e91a61ade/60989469093.pdf
    • https://mkontakt.com/dat/file/dipepaxefareluzu.pdf
    • https://avistravel.activsport.ro/userfiles/file/74401800026.pdf
    • https://artedelvalle.cl/gal/files/file/direfumepokufutilobop.pdf
    • http://mnwebdesign.dk/userfiles/file/83885509120.pdf
    • https://kingbakerypans.com/userfiles/file/32484744633.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/govag.pdf
    • https://bataretak.com/img/files/file/lufupezumajavofegalol.pdf
    • http://ahnil.com/userData/board/file/78915631725.pdf
    • https://dazhonghua1688.com/ckfinder/userfiles/files/ribukeroxuwubobi.pdf
    • https://ccaquebec.com/userupload/files/21549477111.pdf
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/robimipemolabinoni.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36aa69fe5632bd59a020cd55212cada0/nakamokegowopifi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=app+wifi+analyzer+android
    • 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_off0000b3da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DA 16792 bytes
font_01_sfnt_off0000cbec.bin
cb903189eb21952fe09e569fea0c2523ff68b79eb2ee3cc427900a712b855c77
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 17680 bytes
font_02_sfnt_off0000f90d.bin
e159cf3457cbae8ee09e95ee8a3f4363297e7ab270ef73a377e184a2c284ab97
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10468 bytes