Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eff02a6d0da1cbe…

MALICIOUS

PDF

95.9 KB Created: 2021-06-24 00:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0b62dc2f7d0ed386a2ee0bd2ad5861f4 SHA-1: ba94a57ac693cdf3ff5f5e9bad4dab5199a830e0 SHA-256: 8eff02a6d0da1cbe9051008896601777bf008dc0649ec097bcd884933551708a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating a payment redirection lure. Multiple URLs were extracted, many pointing to compromised CMS upload storage, suggesting a pattern of hosting malicious content on seemingly legitimate but compromised websites. The document body, though heavily obfuscated, contains text related to 'why is the sky blue yahoo answers' and 'wkhtmltopdf', which may be part of a social engineering attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4191894136095cdfcec2db.pdf In PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c629c485---25370602911.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6619ab659d---derafelisilesen.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160956bb928f58---xapopefatu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/j974ka3fvt7gdbgb7covroaqa2/dotew.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/75406542172.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/94323451504.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b3fc159ab4---fefisodusata.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8f129804a---93521049447.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/95250445471.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/zevaleduwewiguval.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fcd4c4578---83152319839.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/92e46a60d6225ae894048d16f6f0f685/14168049834.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/nujuzekusakexaz.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/jolupawimetugofipadi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6e41af19---81602199373.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/62916402190.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f2c4b62887b1d951f591dbeda4af7ede/gugifanegotapusoxuvi.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/6540d4bfc44cb459738d60a6019cb303/pidosudadifokevik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=why+is+the+sky+blue+yahoo+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 16660 bytes
SHA-256: 147a4c19ca32598dcdf99bff871c9561896bfed5c77eefc9bba99d2a87c53bda
font_01_sfnt_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 5184 bytes
SHA-256: 16a8aa6b34e970f0112c072712c5a846846df8048facca49d67fc2407f722fc2
font_02_sfnt_off00014909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14909 12256 bytes
SHA-256: aaf61f87ebab5119847b4a9a6d88041687d5275097bc2c9d9f6ad6317fe24b18

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