Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caa9f81e561de5c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-22 04:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37b3990ec3a812ce4d1ebef6d61e25b0 SHA-1: bcdf40adf74c0baedb588b9e845c6e019749575c SHA-256: 1caa9f81e561de5ce10c948ab353716ab7eccee8b7fa3a1be1beb7bd9e707c05
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jjcfurnituremaker.com/userfiles/files/58892603054.pdf
    • https://koratspring.com/upload/file/gavivusirinawaguvixifaw.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/vipoxizetebal.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/30554565150.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607121f1e3b64---dijirokimokiva.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/60a5394d91ed2c68c8c2b0bb8324f26d/10606520414.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5e5d23a0---96068804740.pdf
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/58135316476.pdf
    • http://capital96.com/userfiles/file/35845157344.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e8297e7a2---27883695621.pdf
    • https://lacecinella.com/writable/public/userfiles/file/sasubabefelizulumuk.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf19a56523---41164936982.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d523f808b9---bavusug.pdf
    • http://qtjdb.com/UploadFile/2021/06/01/file/20210601_012029_162.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/31357790137.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaa71ace4e---walimolomidumuju.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97adce2ff2---39754973615.pdf
    • http://secretinvitation.net/images/files/83882467207.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6068136d4d3cf4b9c2fbd6c04580cbd9/31897828530.pdf
    • http://pk.mo/userfiles/file/95962185548.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1dcf967f37a60f5c9b281c69fad39073/jibisa.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/jagatogesumivovotasutirej.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd1279e5d---zekoxu.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/12176969133.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/72769509167.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+place+to+see+the+perseid+meteor+shower
    • 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_off0000f733.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
font_01_sfnt_off00010f45.bin
0a04fcaf715b7db4e6653f15cc0196150aa3978420e0cf17e10942f721364328
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 17572 bytes
font_02_sfnt_off00013d3d.bin
9b6c16db57c1d91de416d1a8f536eb8a0346864ca7036809309d6ac41f475dad
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 10812 bytes