Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b794e9eb547e1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 14:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53b905c08b451ad36ae65e7a2edb6730 SHA-1: 542431e56ade2a28c73317eb209768868cbf8175 SHA-256: d39b794e9eb547e1eb8ff498aeb9cc46ad75e3f8d5caf599023705059c724c86
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://raptiherbal.com/ckfinder/userfiles/files/xopurodasogesuteb.pdf In PDF document text
    • http://maximaviajes.com/FCKfiles/file/domofow.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/wufemakopiwid.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6f11c47789b0e6054f365b8f988c92a5/ripekoviwedowa.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/labemixetotegoravuk.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/monujixewidulezesot.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202172954441182.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c00993ef---74953057747.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608053deb973b---1822803153.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/98122532519.pdfIn PDF document text
    • https://rotitelor.com/contents//files/netosex.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/45204968326.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fomovo.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/xiwutivuwitututumokumal.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/subebubasulewezaputogidu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceae9086bb---75806668734.pdfIn PDF document text
    • http://goldmustang.ru/files/files/dulapitopilelakuvutevima.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c32a9367e---wufonuxesalu.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/c390bb69fb14acd7ce1c2f7e78ec5d18/zaxugosiredilozomadajutiv.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d7778f04d3787de5ab57ea662ce615e9/ruxinilubozupokedupo.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4635a70dbbc443b42fb072c700e08dee/77425737576.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/64034397494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=learners+licence+test+papers+questions+and+answers+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_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 10900 bytes
SHA-256: 11c7fdf9ff699c9b7c6fa7311e4c0f6779f8b4de3a4a731ca32217ec3195c6a9
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 19948 bytes
SHA-256: 6d34ae9302019001ce159eff03af8d5c9e1d4f38eb5c69147cba0cb927dbef2e
font_02_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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