Malicious PDF — malware analysis report

Static analysis result for SHA-256 d031f431fd8f5475…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 21:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7da0d44d51bca76156ade77b1bead908 SHA-1: 8079735d09aadf3726b02e46f5561c6099ace4f8 SHA-256: d031f431fd8f5475f9ba041ee68453bf2b48a970fcdbceaa0026dfc6f61bb900
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous unknown reputation URLs suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/83e9df41629d89f540db2c52dc8be311/99987215425.pdf In PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/25835999125.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06209d6da9---jejajagefi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/nufukof.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/newovixuxekegopa.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/2rr8p5tuhahkq0ij0459a66e74/63849006046.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/tagorepixediwilogipapu.pdfIn PDF document text
    • https://alutat.com/data/file/87682740245.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/jomeliziwebapebanepezesi.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/85117490590.pdfIn PDF document text
    • https://mashura.co/userfiles/files/8741991515.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32f6312ea---nisaxifupeworogi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050602551673499.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/cmvlqps708b84tpaek9gicjdjj/donikaj.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/wakediragewututemetujak.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fafa1d53b8526bca728df0b5d5795579/ferudavimerubuvibot.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610dc4da17---taxumovufifopuxi.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/13221466931.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/kojuxulodijeviwuxeg.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/57391881852.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c23f8e8aba62c2b292b15bded747c051/6131871827.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/sobamulefasebepo.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/totirosubamisegito.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e4f7c9693---rokijajufub.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/76f64455911b90f9a8d7e010d00e4a21/80775912388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=word+to+image+convertorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 19120 bytes
SHA-256: 56fab7d1eb3dc3399e4381c3309657e8e1fb99138bca40bc8edfa7257a67270e
font_01_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9D 10556 bytes
SHA-256: bb272aa3456c411fad1ca8c028cf1378ac23dc7131d336228d4d97e31b83cac7

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