Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8401d9b0f8f45d8…

MALICIOUS

PDF

168.1 KB Created: 2021-08-19 21:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fd68d8db56cee3c1be55b6e30abc5d3e SHA-1: ad3514a59d94623ae60fa715f7d74ebf20178e8e SHA-256: b8401d9b0f8f45d888551224f6b105dca49a5db367d53129b833a44eb442315d
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised or disposable hosting, indicating an attempt to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into changing payment details or wiring funds. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ouhkpthaa.org/userfiles/dexanefufinefefa.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/pogefipaxowe.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd9b803a0---47970210214.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5855bc8c7---58653653942.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e3ebf5b3---wululebidetexajufexumawij.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/vixukadebejelaguwosa.pdfIn PDF document text
    • https://kede.org/userfiles/file/52642302624.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/6129187713.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/63587305987.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/81374301380.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fuzep.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/88467996586.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d306d177ae9---48828271345.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gajalitopodemiwej.pdfIn PDF document text
    • http://rc-modeller.se/images/file///88982627742.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/99355506854.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/82858815504.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9fb2c03143c961d2da452f17d617429f/levalojuxagovebajovupewu.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/69317312730.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/18177773718.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/50811b6dbdba967ddb6e0e12a816cc58/fogiba.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26268b3d0a---53527325195.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a522e1b1f71---90127233155.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4e7560ec23390b3b1eec6346d7cc804e/9461851791.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/42897273765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+stop+corruption+in+politicsPDF 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_off00022e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E89 20000 bytes
SHA-256: ae0b937c1973be5d4ca0a6b2948798ffbcbfa06c2f98c394fc2fc35118f9bb25
font_01_sfnt_off0002616c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2616C 10252 bytes
SHA-256: 009b9bb005e7c7d438e12cae18dca6167304aeb90eb800b1297625281cf477e3
font_02_sfnt_off00027896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1