Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc597bf0d41dc47…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 08:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cadaf980534591d56c3d03b1ce60771f SHA-1: 5ef781720ceb36ca2bd9583a6bb5640c849bde57 SHA-256: fdc597bf0d41dc475288180fcb52af4028465b7f8bd61f6d9e4cc378d0708cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious PDF files. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nomylo.ru/uplcv?utm_term=pc+synchronization+android PDF link annotation
    • http://fecirturizm.com/resimler/files/44163237418.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/zutexibuserarowawi.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/sagiranitoduwer.pdfIn PDF document text
    • http://juentai.com/userfiles/files/45410583188.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e64868eba9---81015719822.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4a8b8fa8---66940132497.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb3b0ba83---84544169082.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/208360024.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64125913855.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/noxabepuxemumumedujozuraz.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/rozowodagalok.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31587708b---71499218451.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/kakawo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed02d3b25b---52777101381.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/40648069520.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/25349944533.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/34611682461.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/42540961605.pdfIn PDF document text
    • http://edituj.cz/res/file/wubijowiguzebadojisam.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/debureriviruzu.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/jakisazefesobuz.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/39154265138.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/sagulewo.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/84440663070.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/36229815701.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/gajuguvoraxutekojuri.pdfIn PDF document text
    • 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_off0000b288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 10464 bytes
SHA-256: afd065e96854a2585cba002adb256375d9d87a9abf856a9276305a1d8c1cecc3
font_01_sfnt_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 16364 bytes
SHA-256: 147f376f0c9d9de99bfe01ea364ddd2dab18af40da99d48bb5052741b878de68

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