Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad5480c9af9aa82…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 19:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c2c0b16e3782d2bfc42179becd247fd SHA-1: 54a107a6147233229b3fce788eb0c22d2055defa SHA-256: bad5480c9af9aa8265fb700c28168333734b67b87edc5b42b990fafc4224ae37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with numerous URLs hosted on compromised CMS platforms, specifically WordPress. The presence of external URIs and the structure of the PDF suggest it is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://crewmak.ru/uplcv?utm_term=timber+ground+floor PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/p8avurtc1tilckgfvtthod1ub5/degolejexa.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/6417214101.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/43159557337.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/jatetomesipiro.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fukikoxomelotapivapikagi.pdfIn PDF document text
    • https://turbooto.vn/upload/files/58334950996.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/98122191628.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/60687003568.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/wokagefozod.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/lunoxuxejiraji.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210909132021.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/51214454790.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/518e73feab31db770f1353b1d82f4318/97682670825.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/xowozoletupubogaguvek.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/bapeguzurotaminupaxozopo.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/monatuxexopegaxe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f3c95c4b---gosawiw.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f3795585db3cc00392c8a3c9be67cc01/dufigemilogofipawida.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78d28be0b---51563911019.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gunuvisuk.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/dewakabido.pdfIn PDF document text
    • http://storemisr.com/uploads/files/4883677508.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/65071161340.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/17284391408.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/numeligozevopoga.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 10472 bytes
SHA-256: 189b07402a032a2dbcf80a9e82b0492446e2c14437e0d160b96521cf8dfd39c7
font_01_sfnt_off0000c83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 15080 bytes
SHA-256: 460b34fa14503d30680c95dca9c47c3c3a8973cd0bac6ab0101ab29dc99be6b4
font_02_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1