Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26d3526215f7480…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 18:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd206ebc1da6778daa949e6bbad73a79 SHA-1: a0870054d7e5008e7dc430b5ed4251449e3fbd7f SHA-256: e26d3526215f74809229b0f6da3fe2fcf5d6c6b5021bc816ff192fc09f447e1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malware or phish users. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/8srpptlm30r3pvmfho4l0pmpnt/bowugupojanigosapowuw.pdf In PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/85c439098443d1cebf190cb15b4e5fbb/91611445515.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i37pq666aq315i1g91efqlijip/40137244935.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/muxanimidixawazexitar.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/68735109192.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16109882b9ceb0---zewox.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/rapadixud.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910b851e4c3---punakedujetuxivumikidowu.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/kibad.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5125cda70---tiwej.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983004f2c3f---89583541947.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/maxejarixasijiwibavagibi.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/belipebafakumasowixusu.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/12284605639.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d17687afecf11bca810aa33c4a931932/xojomi.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zobar.pdfIn PDF document text
    • http://anpo.vn/upload/files/63768230631.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/95ba5f73c526cfa444da6a5fa5db10df/kikuxoxevadoweno.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/kanijifukakelil.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/74201284303.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/davisanizidor.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4b560ec3---53312730218.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9cb5a813bc9114b29ffd13434fc9aa30/83353237054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sap+hcm+tutorial+pdfPDF 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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 10656 bytes
SHA-256: b998003c104fee7a4459b6494318ff1781b399d31e808a8ff34a0834c8c08790
font_02_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 21412 bytes
SHA-256: d1dedcd34aadda3dd8d3f032de026adfa2c6ed0593906817040e34d66cc40e00

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