Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dabefa5c5fe3bb7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 20:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d02f0e88abee70c267e3977e59fce52 SHA-1: ffd3d648a5c1726a95114b36b4f19d7c44daac88 SHA-256: 4dabefa5c5fe3bb754d7af941abf3e04b207af8be81222aaa9426bdf14bb5fd2
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 websites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6674

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://fortworthdental.net/cmsCart/upload/file/38752319924.pdf In PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b50c7bc42697eae04a3aab5aaa864459/poratimozasunejijudizima.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202108141524373904.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/jomuwezinujowupunuj.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/vinerewojari.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/gajuwomakuboka.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cab67daa3b0a127d0aa9a2069afc0611/2935327858.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a0ba42b8aaceae40153602708cd1951d/vesatabazolugodofewupurot.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/8993186818.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/9170183673.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/2023d6e700048f901d98ee965df2ea55/jamazebijun.pdfIn PDF document text
    • http://giga.sk/storage/file/zitusadojuvabokijogen.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23bb76a070---5878430307.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c86542e4e0e---voxat.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/vipukep.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/381c088948eb1cc22b958d3f8f81e14a/28095870558.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/dojitukotakisubexam.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/64233764318.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kajetelajenowapefewo.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/59252855642.pdfIn PDF document text
    • http://zimmerei-possert.at/mogamipasub.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/sepagavamesitanodonusuk.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/logodosevunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=color+combination+theory+pdfPDF link annotation
    • 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 17572 bytes
SHA-256: 25bb0f00e820f59c7278ef29c2db63ae78bcc7d2d81281a715fbf777ceb621a7
font_02_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 11000 bytes
SHA-256: b93184e0fb5aea3dbb3123f37c0767ce34f313d038321102367fad7e0f2606c0