Malicious PDF — malware analysis report

Static analysis result for SHA-256 322005435e5028c9…

MALICIOUS

PDF

109.4 KB Created: 2021-08-03 11:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ae2ae06b50159cd006c3a78ed4b5669 SHA-1: 71a491cb0adc3e1fad41d74a80bc53e6f0a8e655 SHA-256: 322005435e5028c95079ce7aac8518fd83f3deac2d8f4ebfef38739ef653abdb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous external URIs and the use of compromised CMS upload storage are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c5932f6c---pimixorinijivolobo.pdf In PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d70cd9de77---59860716396.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/t2s8jslk72mhsobsjpadri1icg/26180901037.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/luzizitovev.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/g44knf60350qi76m63is1apd7v/gituzuvotisaxu.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/38074906244.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210627061016_0c81t1.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9ae5e502f---xuvisodetufureminuni.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16070883a68547---28666191171.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/58666712505.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/dinefagetepuvojomig.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bivpd499d8drjnv0gml753bvmp/tomezeremesinavugaraf.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085467783e2d---29037069043.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/velatikebo.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbc0baff2---dagekegukemu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/v6uk6dfpld5cl4ahhbdn8k6q49/jusevuwumusadoke.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/xowimulos.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/33349433627.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/sulepefuzoju.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/12159722822.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607279e1d688e---lulexodamametodifaloxat.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/penopuravobubijonolemosat.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addcf1a60f8---rutusufikaxujasesekow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=basic+concepts+in+inorganic+chemistryPDF 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_off0001479b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479B 16852 bytes
SHA-256: 9a478f93c3949fca84b9ced76d058d005dd2ea9be5c44926cc0505020e0c34c7
font_01_sfnt_off000173b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BCB 10940 bytes
SHA-256: da4bbc152c86d0501dfc1dcabc7536e27c714ecc04ec24736b9e512e440ae74f

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