Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa503957ebcd334…

MALICIOUS

PDF

83.2 KB Created: 2021-07-18 16:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 838cc459b93be335d6bffe65a0428af5 SHA-1: ca07a74c164624f8deba441ea7e12fd61cc9a3fd SHA-256: afa503957ebcd334d9efe5a5dc028ce717fd6044d57525913622dc7c440ebd53
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The primary attack pattern involves exploiting user trust through a malicious document, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://axwelindia.com/uploads/87631610663.pdf In PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/movazulasepajikana.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a371ab38ec4---47494749719.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092909e5003c---71706626144.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/88489517213.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3c520f77---peweborazebedagorazofof.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/44930488657.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/jutoxujujekexuwobojojil.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2615e7139f---kivodusobuxu.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/7793081491.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/b830d8c78f86bf4299280dde72b31aab/xajekapirafamefarulit.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/24807546262.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e798775e1e1---xolegugojawomugulewavifa.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4e88729c---bevivobebamolupagokagojak.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6595ca9ec---rafobeselixuxopi.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/latilukusibulatar.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099706caed11---butevejogula.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5ae09bc2---disameladajozazebiz.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/35042775127.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb596634a6---99079636491.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb033316e4---tizotanuluxutejumawe.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fb8c23112b845b144ec3e8a71410c67c/85009818731.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ebf5b40071913dd5f556f4805d5fb672/2152826801.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jtehsfcbkf4heabnpgjvsd5dg2/90094557414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=comments+and+concernsPDF 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 17140 bytes
SHA-256: b26b3668cad855ad40ea9a42c89f5da751038d7eda13d75cb9415af66084d945
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 10424 bytes
SHA-256: 7f0b1c7e29e1d29e3fcc05d830be7178703fc9cda4ca8c8fda2156a83855bdbd

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