Malicious PDF — malware analysis report

Static analysis result for SHA-256 508906f7014e6e64…

MALICIOUS

PDF

83.7 KB Created: 2021-09-11 17:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3507d0cbee74eef164d1cc2239d514b SHA-1: 04027c8f2e74dfbbf7c519bad43ed4d9039e5c08 SHA-256: 508906f7014e6e644c650f7ab2cfdeb7f182775d9b26e27e1675a21c30e72597
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social-engineering lure to prompt the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The document also contains numerous external URLs, some pointing to compromised CMS upload directories, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=how+to+change+your+notification+sound+on+android PDF link annotation
    • http://songhandiban.com/uploadfile/file/2021090300590073499.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/teloluvujunonev.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jisivuwanuvonumogosaf.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/fidivegudewimoxosawuv.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/jabosolirotewetuwora.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bagobajefepobinebu.pdfIn PDF document text
    • https://duel.pl/userfiles/file/93356656491.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_425EBF930354680F.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/38685571713.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c344e14cb---votatokosowuwazu.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/zokopidabitebesu.pdfIn PDF document text
    • http://caythuocnam.org/images/files/35710885847.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/newevinuremegilof.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/lesofu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613739c721926---89926981944.pdfIn PDF document text
    • http://surtek.biz/image/files/20150319_031814.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/eddf1661b35b69b9e656c1cd82e6bbb4/xemixosesisabesakideru.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8fp29afn468355d8k3bbflt8n4/87880307638.pdfIn PDF document text
    • http://djpress.pl/Image/files/60135423408.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/60603494540.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/53176859474.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/39426596519.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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 19840 bytes
SHA-256: a288ea1fcb471bda4c2cbb7b21808f268dd7f40c42a9c49844a773ce71ad192b
font_01_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 11000 bytes
SHA-256: e8038a0f7a504ddf6d234b059df7176a032a4045b3f35687df3c297cd8983de0

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