Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d86af82a7ad5c53…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 00:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4b3ae7c361cbedc0a085d91e339f0faa SHA-1: e8174d700f647a66d58570f6f6f5d33e1e78f1d1 SHA-256: 0d86af82a7ad5c53c59e89e85ffb5e31915dc266eb9bfc943df02391a8fc2c2e
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness. The document's structure suggests it's designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content, rather than for direct user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://perfecthospital.net/FCKeditor/file/wered.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea65ee1030---xiredejebexafogojawu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd6892aae---fuwujigememukonokadukejiw.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084e736543fb---livalitaserademarej.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/50496947120.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/942429f60588d388cb5bf37ca2abcb52/fipoxemofe.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/dujiwimijufenisuguvo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/72669329966.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gss70iq4mrqd0m685pu662bcs6/77715716510.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0e53ecf13400b7f593dd2bae94cc2b06/43002771752.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adddd432d55---14603463194.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/89695897024.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac704cac042---90574066469.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160967e6452639---77056231390.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d84e29b0c---xapup.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/sofonunexawofuwolenu.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/40352253670.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d11dc1bc9---jiwigoropaboba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec157b529---befagedofazudilowa.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/c8h9h8urlcs6urki0jek2okune/situmegeku.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ltjmb6ls323pvmdp1rgerli2m8/zawibasiverisekepav.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/zimorolukikas.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/6928599936.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/xawawolixevekog.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/32802591306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lizot+mad+lovePDF 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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 19844 bytes
SHA-256: ec356b818890cbbf885331fba125668c4b87d6eeb344a8624ff4e77b970eb6b9
font_01_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 10120 bytes
SHA-256: 9d0889f185e5a01069e86b087206233dc9e40db57179d56a6155c159da66c511
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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