Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5097b619ba1375…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 00:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2029293551075fb161ff938c7f274a43 SHA-1: c22a66093f251b7ae7183056090a6bcffdecf120 SHA-256: 5c5097b619ba1375f8a31f48cd1ff94fdd339d378cc4019d23940c1dc1939b38
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://lamgi.pl/ckfinder/userfiles/files/xulopotativap.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/818467702.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/83900092733.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/89623477256.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/wogeginuribimazuravune.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140edfaceb58---dapupuvomaxu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/98064069345.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/40829051667.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/43102523497.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/fabirexifas.pdfIn PDF document text
    • http://cl-pub.com/files/files/potodojosefavovetame.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tuvijumejuloxumulizema.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/jatofo.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/nazuwojijadenesirok.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/nukumisuramipuratoba.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/10535415104.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/36703052480.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/64295034214.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d6b0b48e7c566ed20af6fdcc2a64faa0/kevufo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5378909d8d88d3477044173a440b28ac/1894707665.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/jebomev.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/rogidasubifidixalute.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/puwonurazukikoroxajuv.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/jomexugegasuwebub.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/91103557419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=m8s+pro+firmwarePDF 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_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 10560 bytes
SHA-256: 994fabe48b679c43bd7c56c3eda3497873cf3e707ec7d1098562f76a1324030c
font_01_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 18372 bytes
SHA-256: 201faa0507103ac2da0dcfcaa07b970f03a9a25568db4ce863af7308d8db4337

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