Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e4b39a8838ceb2…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 02:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 945785868b01de93c9f04e2167199965 SHA-1: fa01145c3573edf27653e38b0b2612bf622a85a2 SHA-256: 44e4b39a8838ceb2f2a6ff36fa533ce54a9914d7f2fc0f695c6eb4b120d7ce3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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://laborke.ru/uplcv?utm_term=dell+netshelter+sx+42u+rack+datasheet+pdf
    • https://medicabg.com/uploads/wysiwyg/files/8322511026.pdf
    • http://jkohut.pl/file/3271981324.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/waduve.pdf
    • http://reelproductionshd.com/userfiles/file/gotewipat.pdf
    • http://chinalabware.es/d/files/42489970822.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/81300594426.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/65247488976.pdf
    • https://kohphanganhotelandtour.com/userfiles/file/87490539384.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7umkkl1ivrjvpsqi8355ufrf32/juguvuravobajiwetulexu.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c962d9a7e82---14999321028.pdf
    • https://burgaseguros.com/userfiles/file/89804775978.pdf
    • http://tamker.hu/userfiles/file/tusenikuwilis.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/200d78ddebdeff819b6d0786a69dce08/30655847704.pdf
    • http://slovbau.sk/test/userfiles/file/15877021945.pdf
    • http://ruishikaishi.com/upload/content/files/2021/07/20210722061653.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c7eeec207ffe2cccf341086c19ffe49b/29419759874.pdf
    • http://xahscw.com/userfiles/file/42059485276.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/siniw.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609346e416e09---55936345059.pdf
    • http://ats-dz.com/userfiles/file/bekiz.pdf
    • http://africareview.in/userfiles/file/vuzevowunulib.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/gusuva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c336.bin
e8749591beafa561a5c2853d1d1e7816b5c2fbf3dd43b021a297d862c3df869c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 11000 bytes
font_01_sfnt_off0000dce0.bin
04e052ca6a86553e845bd65f071917c8bef45b7b5d885e064fe71d3bc265fcac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 18324 bytes
font_02_sfnt_off00010cc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.