Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7f436eaf2049f5…

MALICIOUS

PDF

87.1 KB Created: 2021-07-20 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9d59b9a8eb3901de8944401fec00fb2d SHA-1: 6ca1e4c23d609d7136373058619a9d8df1b847ce SHA-256: dd7f436eaf2049f5a11943fec26ab7494becccba0097a774b838e87ea24723cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The primary attack pattern involves luring users with download prompts, likely leading to further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://briljant-maleri.se/UserFiles/files/ranarikixajewowulama.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/g2q6t3q2m56vfgfq3t9gmdi3sm/wuvomogorupunuzojokolo.pdfIn PDF document text
    • http://ccshecea.org/upload/files/rafaxaguwebonus.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/vadosamagepamobev.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o5dn1naas3orn0hf2psd760q7n/66861103572.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e62608cdb93---10435119777.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb3d706388---wafawabuzudajawoseroba.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/stu7igkulh0dpd0p64gkluulq2/61277713573.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/cuc7rqact7tm8aidu7gtvkct27/44015816289.pdfIn PDF document text
    • http://aps-mes.com/files/file/26378560604.pdfIn PDF document text
    • http://elm3rad.com/file/radegij.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085433f7b3fd---77754721786.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/31545160359.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0527574317---xameti.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bidafugesifuzo.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tonezanufani.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/40948170868.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/175257087.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de685429d27---kepawegazozafesofev.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/19662893013.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/8895596300.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/lowuku.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/turovelu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/t85pvda01n06cok9jur07lcri6/28642941988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+office+2007+portablePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16848 bytes
SHA-256: c54fc1b8c264cffdee87e3f2d63cca285e97e91a587d579e7ae851a0c5ca5ea5
font_01_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 10964 bytes
SHA-256: 06f40b71defc28538e98d0c92465ae67f25e32ccfc32f5b2248818dc6ee84f48
font_02_sfnt_off00013745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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