Malicious PDF — malware analysis report

Static analysis result for SHA-256 960b8e35950db4c8…

MALICIOUS

PDF

89.7 KB Created: 2021-08-14 18:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4680ca1f3fa340f2ccc8ab8f7d6e092 SHA-1: 58b7b3a292f6681972257f9344ae8603b5430753 SHA-256: 960b8e35950db4c8ae636c985a643007febe0ad5129a10ef15de17af5b7e2c85
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630453b728---rexulewogugafevajexipaso.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kokarifabuxopidu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe5c655448---maduzalutofudik.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/4aff50a3f52053526dc40429f826d1ef/maruwuwutebuxadobipes.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f49cdfa87---84529154233.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/30776401536.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/77566496219.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/zapepovi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dd33abb2---paliraxedun.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/gagukimazebafaxovewoke.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/gojasumebeb.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/lujubusezowukamufemuber.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/12868074847.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b81de1c93---58797113038.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rpvu6h4t8p7ip0a0cjqu3hu22v/dekebo.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/gorapedewujisak.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/13017940884.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/70917395460.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b42bd4e1---fotawexugijonajowutiz.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/42bbf2def1cc4c28f8d36a15cc32f680/lolawalakunexuxexamasote.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/tewepotomuxizulikej.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/24778479147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=coleman+power+steel+swim+vista+series+2+pump+installationPDF 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_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10816 bytes
SHA-256: c7d6ce80f2b3e1f329770f7910c665c73701a3a05f9947c286dc30ab7592b470
font_01_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 16164 bytes
SHA-256: d3a828a281820a2c7471ee293fc1aec8091032b0b518eb37a9ce04af9b490a11
font_02_sfnt_off000140eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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