Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a9a642c00ee22a…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 23:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5020fd93656b8b933d48038dd7d9e33c SHA-1: 8d7f61c3b92762b7766347e30094762f5ecd71e9 SHA-256: b0a9a642c00ee22af47d92217a627f0b0f4637bd61094aa6ab87a922847f3c91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating phishing and potential trojan activity. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content are consistent with a phishing lure, likely intended to trick users into visiting these sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://archism.ru/uplcv?utm_term=how+to+make+a+video+live+wallpaper+for+android PDF link annotation
    • http://studiotecnicobonoli.com/userfiles/files/dasif.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/rorogarabuvuni.pdfIn PDF document text
    • https://el-tall.pl/pics/file/degipanitadawa.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/60983607313.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/89727273358.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/59335838129.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/tezor.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/bajotabulemalapinaxan.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rexolubolonotirugegowu.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/23182983930.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/sivofifuzafuxob.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/34194246732.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/10932069718.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/gililetudazazisiguxolo.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/3173289952.pdfIn PDF document text
    • http://kalikraft.com/images/file/39404692418.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/77019088677.pdfIn PDF document text
    • http://adice-area.com/pictures/files/80559098468.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/fawajidinixazizo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612feef8a2e5d---fusojerazosenepixa.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/91040156403.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/54845388676.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/21962115730.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/samagikuvo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18f3af3ba---42215570244.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/fanavugajodukotufaje.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/8597888928.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_off0000b260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB260 10728 bytes
SHA-256: 3d777b87422eb1723c3f59ab0ebd33780002d7eae16d4a7a0a2764a115773e9e
font_01_sfnt_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 15352 bytes
SHA-256: d319bfb251ae92154e5a1dec6cd2f4d8b8315155c46b990a843aa815d9be8a13
font_02_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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