Malicious PDF — malware analysis report

Static analysis result for SHA-256 7791452e8c94a305…

MALICIOUS

PDF

83.8 KB Created: 2021-07-03 14:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e11783e085cd89ce534bfa0bb891210b SHA-1: 7c6375e312abe3a1ccbff1296bea0c959e3e8bf5 SHA-256: 7791452e8c94a3052c970f87fb42a26e985a8b9d6ee45747e8ef0c10f8db7051
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress installations and other domains, functioning as a link farm. These links are likely intended to lure users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a3052fc9c42---85231486104.pdf
    • http://novichiha.ru/pic/file/koxenikejuduraduzopularo.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4617179473---wokoxowijibojegisewe.pdf
    • http://novichiha.ru/pic/file/33606524810.pdf
    • https://tort-art.ru/userfiles/file/9345824329.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/33ed92f1593bd9a1025222a19b31debf/ruresugoj.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f33ab04d---lojujanegajeliba.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a05a1590---88083657937.pdf
    • http://sammyuriasproperties.com/userfiles/files/wijutarogupizo.pdf
    • https://vandolderskb.com/images/usr/batotunadezik.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/h4l9dimo5ffotqrpjvv5ef0pm6/gawajarikikogedutepa.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb376d682f---29267624557.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e9ae2da109d83a49fd27e52e7b84fb02/95377082931.pdf
    • http://karat-dobremiasto.pl/userfiles/file/17216199682.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee0611c0d---27760755792.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b586257c236---30050022837.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/15d1e35bb8e66dbec7864b5f800c40c7/xukeris.pdf
    • https://mariellatriolo.it/public/file/1813400761.pdf
    • http://aihyang.com/userfiles/file/kemogumurogobaloxuf.pdf
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/zevufuperijiwurumotiwu.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16211707702393.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f961ade960f18386a9bf886dfdb85ae3/72804698880.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c967f36a2---kapuvekowasikavagugafoxe.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m5rmo6elnc3q7763nf536kr2mj/wanejezumunagexonoboxeb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=merge+2+pdf+pages+to+1
    • 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
stream_003_off0000f9ee.bin
1091d5ea804bea2efea0fcbabda99c1a37a900bb6d392288c3d15b8f6402e275
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9EE 17564 bytes
font_00_sfnt_off0000e1b1.bin
74f5362f1e345b10dda81c69e4b6cd1fe43dd8de0b47b6827e5f0d34cdc848b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10596 bytes
font_02_sfnt_off00012827.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 16792 bytes