Malicious PDF — malware analysis report

Static analysis result for SHA-256 d137983ef65cf16a…

MALICIOUS

PDF

104.4 KB Created: 2021-09-02 17:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: adaaf8dafe00460bb210cfc8885924b8 SHA-1: 72749641ef371b0dec893def6cf7d3bde25a845e SHA-256: d137983ef65cf16ac5a22560be6f31ba6734751c3368bb7078628eeff0180dbe
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggest this malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://formel1vermietung.de/userfiles/file/zexapujawobapukixeto.pdf In PDF document text
    • http://polimak.pl/userfiles/file/76760466016.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/01bd8acff62d918e2b835b620006f18a/nogawakimujotepomavodop.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b03501c03b0---21504943925.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/88388380278.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/lagedifaweligudiporo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db095d90312---kikeneboveguzug.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53579310f2---vimizerazepipugar.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/718f7857095824e1d3ec708b0a4a1696/93301967798.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/netamiritorix.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210803172449219.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/wewivoxilaxadur.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2n44ou19jk7kkokdjfltsprudh/gurijimezovil.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/6685044183.pdfIn PDF document text
    • http://staropolski.net/Upload/file/38732726646.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f132fe5174e970c771b8531df5a8de44/sazufovedugunu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbaddd9e2---julifozifo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cc073208---dikogoxulubuwojiman.pdfIn PDF document text
    • http://szwygs.com/upload/lusedawujujibus.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3b004437a0c467eac3bf4cde766be135/wotedugavumejiporoladipom.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/modizumudadogibupexopozor.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/287geo8m4u6q3oe1u1pvcj9qnk/muwifogusij.pdfIn PDF document text
    • https://unitjaya.com/contents//files/23875643254.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/83390501468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=phonemic+awareness+blending+worksheetsPDF 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_off00012e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 19996 bytes
SHA-256: a85346aabcea3ff442e89ed368248b8de7410651dc4bb9623b5a5b86328bf3b1
font_01_sfnt_off00016224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16224 11136 bytes
SHA-256: 9306d6010604920f77244fe65c73ed7896344672029ef4c78095640d038a12df
font_02_sfnt_off00017bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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