Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ab6db7fa9f8e39…

MALICIOUS

PDF

96.8 KB Created: 2021-07-01 13:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd8af094e3282233f6d22e7da57f3d60 SHA-1: 900fc0e78454519c9356271ac483fdc0608356b4 SHA-256: c2ab6db7fa9f8e39773d8f30c9b6d49c4d44ca5bae64e834275105237bfa14b4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely to distribute malware or engage in phishing. The PDF structure itself is simple, with no scripts extracted, suggesting its primary purpose is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/as52v020jcd5v0ar1scdl6gsn5/libudixazelabaguxup.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085481eaf50b---kitujevenodovizotuvinow.pdf
    • https://detectiveoffice.net/userfiles/file/jifadibumofexudokixanovun.pdf
    • http://tai-yang.tw/taiyang/upload/file/76185707897.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jinif.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9cbe29bdf---tuvuwotagitejotojabuxo.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/48651537751.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d467ba33dc9---12620316987.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a5edfa51---pezenipujulegoxupaxovowi.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5665169892703d3582f1a8fb084f166d/47343822691.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/7142763bec65fbc02f24bb745722addc/rolalusetekupo.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4d34cb5e397f2246bc69527da2aeb8c7/benojowegade.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d326539920a---xufewixegofel.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ebe1b7b35---vawuvageliworugaso.pdf
    • http://kxnjl.com/userfiles/files/82209430167.pdf
    • http://nguoigiupviec99.com/webroot/img/files/jilaxoruvosunovabiguf.pdf
    • http://alliance-ltd.com/userfiles/94832986078.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/471f97fc796c240d22822bf0a2ad0719/risororozatalevukovigiva.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/28eqmgvgtpv00sa8cvoo4i5i0d/69655551001.pdf
    • http://mispuntossaga.com/campannas/file/55016722262.pdf
    • http://www.colormotion.cz/UserFiles/file/33777885295.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0d66bbb2---89918990035.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089b699a4f95---52447306141.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/dubukixazakizuribi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc502b2bf---karefagegagerikaro.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=12+g+of+alkaline+earth+metal+gives+14.8+g+of+its+nitride
    • 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_off0001115d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 16792 bytes
font_01_sfnt_off00012974.bin
36099a19dfe6ed10a4da5f4e0edef01b257a3fe014cadca71b3e3f3e881eeaba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 11384 bytes
font_02_sfnt_off00014405.bin
dc6b446593c4879092d22b5da23b1d17229eeb208d0f3f880f06e79774cae8bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14405 18552 bytes

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