Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9deca282f8dfc5…

MALICIOUS

PDF

86.4 KB Created: 2021-07-29 10:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa0ff747cc99cd9d204e203408a9d2e6 SHA-1: 8549a110f406cd405c640d63a791751c238e28a7 SHA-256: cc9deca282f8dfc5ab0e59d61848cd50906bccc1e01833e2acaec5f34aaa789e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malicious content. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=dau+karaoke+hanet+play+x+one
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed559ea9f0---xujolemonadirunegiv.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d17a7852b854fe229249d7fac07afc15/sowazuropan.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073af3db5b66---juzaw.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02df389f98---42147732307.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe555e97f---43518062560.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ulfbinof62n9f1i5j2us3mn9k4/22328553286.pdf
    • http://kpghomerepairs.com/uploads/image/files/wisumidelisakenowaka.pdf
    • http://romengo.com/ckfinder/userfiles/files/786771590.pdf
    • https://proxus.nl/file/30824347985.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/98277734415fad30f8f1ab6015534636/96035310138.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505150841554442.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/fezojalube.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/mmuaa1gcq8443cbajs00m73cq1/76945559752.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/t8bic6h26sp0kjlq46n55tdqrl/kidowez.pdf
    • http://abwlanham.com/uploads/files/7402151955.pdf
    • http://all-vehicle.net/js/upload/files/xesonobumanoxagupenebol.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160782c73118ba---ruraligapolomokiwego.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/fiferifoda.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3c500b91063e86611dad5e7b5214da7f/burodoz.pdf
    • http://zubrcup.by/files/files/42730685750.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73fda08ba---pilejogubaz.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ccaf8012d---94494531042.pdf
    • http://moto-bike.pl/userfiles/file/28013728517.pdf
    • 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_off0000e1cf.bin
adb4925390fc6faf6f80429a1c015765de0b1cd51af2d69475be0239b35c7af3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 28828 bytes
font_01_sfnt_off000119ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 16792 bytes
font_02_sfnt_off000131d1.bin
b1c62844ea91f05a7f5fc76c9864470234e8fbab7b7d1e5838054a5a481befff
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 10500 bytes