Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b49c092a4afe374…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 11:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a61545e3caf884e3391e37e5fe9ad400 SHA-1: 5b69ea2b7982a6fa061de9162c574a788fb1ad2a SHA-256: 2b49c092a4afe3743c82d649546fecb21575ac05491246b28394ece3630b0458
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 to compromised websites, suggesting it functions as a lure for phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc5eb29262bd85f2515e220f7f1e7f58/68627715471.pdf In PDF document text
    • http://rent2day.ca/ci2/userfiles/files/82979402445.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/30847719584.pdfIn PDF document text
    • http://test-immo.com/file/xakunirenudede.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1b529b5022c342ec8c1c5789a7317986/4946096752.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/2175533843.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/tonixilomibotadokel.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/36a91ca10df2ad0d3c7d7d9125b4bf36/gezafeserutowosozevi.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/21359667085.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613742c167a94---jejepovuk.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210913_A1722C8F945102E0.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sazajifodoxafamap.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/93880755326.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614086d767905---9345493018.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/11802684812.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/72a9fbc65263fa3eab3bad387909b0a7/84464042241.pdfIn PDF document text
    • http://zeci.nl/im/image/bitobizev.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/fagolixirivukok.pdfIn PDF document text
    • http://turatabor.hu/media/jugexikixiresibin.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/57215614724.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/rolodaragir.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/10571906698.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109151229057194.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/zepakotolitinag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+galaxy+s2+tmobile+specsPDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 11268 bytes
SHA-256: 7899e8afd21d9d66189ed04e8229465219f384ecfc16a5b7726e744cef651391
font_01_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 19468 bytes
SHA-256: d4027286a22462882e26c2fb5a27da6fd0ebdb0e8dede76e2d6ef4fc4ba6c403
font_02_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1