Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ad29718693ceb3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 04:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3875786d9d70be64e5a8f8758666e9c9 SHA-1: 2a96f19bdedf889ce427239cdc933acb76ac77dc SHA-256: c7ad29718693ceb34dcd3896b97bb0324e83e14012b8801d200baaefa4a0fd1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs lead to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://namhunglogistic.vn/site/files/kifowazagi.pdf In PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zanage.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/54f187b820a36af31cb3121c82d5aeab/lekipimodujizolasilen.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/nugapililutozomolipa.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wuxitaki.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a0b9556c---79892680386.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0375e018969eb9d2e12fb910b93bcfc6/23773388718.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/perimoba.pdfIn PDF document text
    • http://topstec.com/d/files/73446788256.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kozekividisij.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/65876954834.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/62320472444.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/85932056022.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/70695451208.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/vumorovugobasukajinog.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/wigifubise.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/kuxilalixozuxumikufidebod.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/36992622441.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/retufademugivodixuwoxano.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/ralifalera.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rejineburep.pdfIn PDF document text
    • https://aneri12.cz/res/file/93874795733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=survival+squad+download+apkPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/34483778515.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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 10720 bytes
SHA-256: ab9fc3930fe57cb647f3daed5ae3bb388b64e9dfad8aa38146a9e0c5a505d124
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 17840 bytes
SHA-256: 713139ae54fd40c88e021ef83dc5d7c9c866db65dcca2e8103978fa3ce50f02b