Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb0ecc7f1f0a58c…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 20:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d14c97f4e63b054ad4598699d585c67d SHA-1: 218b95852fef0ec71c6f6f288773ec2666b2003e SHA-256: fbb0ecc7f1f0a58c76de0c6bb0661710a4b9777a80ecebf21151be77a2ddb14b
156 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 websites or link farms. Heuristics indicate that the PDF is designed as a link farm, potentially leading users to phishing sites or malware downloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=simcity+buildit+unlimited+simoleons+and+simcash+apk
    • http://yogaschoolofkerala.com/photos/editor/files/54462965891.pdf
    • http://reichspfarrer.sk/file/zosotejukeza.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d680d11c3---kufexamokukigawafuz.pdf
    • http://bezagsecurity.cz/userfiles/mifeliz.pdf
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/zuneravimikowawipu.pdf
    • https://dom4m.de/userfiles/files/12648547663.pdf
    • http://compow.net/ckfinder/userfiles/files/32173727979.pdf
    • http://ulsantour.com/FileData/ckfinder/files/20210901_5D4C4BF91753B847.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa58a4f---27931692399.pdf
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/repuna.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ff372c547a556da6d4e46d500c1e6a54/gakuwomuxabusekudugaza.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/84204710413.pdf
    • http://campbellelectronics.com/uploads/zovazatu.pdf
    • https://pastelbuilders.com/userfiles/file/pawos.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/kavumuwuz.pdf
    • http://saluteebenesseresas.it/userfiles/files/39653771402.pdf
    • http://ebiocell.com/uploadfile/file///2021092000100821.pdf
    • http://tokyo-sanritsu.com/userfiles/file/lofela.pdf
    • https://pindimana.in/uploads/file/47043095368.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/mifekofatojurafe.pdf
    • http://rapet.hu/files/29210462763.pdf
    • http://hanabi-la.com/uploads/files/66989415511.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/jk6vlo0tu5edv3o0daevthb3e2/sibifufu.pdf
    • https://iword.de/userfiles/file/nunubudepevitokivuzafutin.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/23834125990.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_off0000ebf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 16792 bytes
font_01_sfnt_off0001040f.bin
6df4024b7b65a18c2b9a3cabc3656686cb4e1b63b2f5d337c2789deb3fff26a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 11200 bytes
font_02_sfnt_off00011ddd.bin
8ffd12cd88db073e6c81cd1bc43df7abab3c3fc4dd7eac0b4ce0272ea2eea4cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 18080 bytes