Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36f048d639df345…

MALICIOUS

PDF

82.3 KB Created: 2021-08-15 03:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb9b646d2f252092e5689689d7078f61 SHA-1: cadb34266fa05c226326107c71d9d91c79e87793 SHA-256: a36f048d639df345ab91725fbc6497eb298181a1ff8339a0834f7cb3b6ebecac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, specifically a password-protected archive pretext, as indicated by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. It contains numerous links to compromised websites, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the overall structure and URL patterns point towards a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9452b90a07---61716394989.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ff6934c8f---xafafum.pdfIn PDF document text
    • http://vucert.vn/uploads/files/manepipolidivoxapotaponep.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16097481263470---48068932338.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/37014037742.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/689af596b8147627109bc0e7fd8554ae/rofukutalalesixego.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/32718758695.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/97985435724.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5354322a---tugexofoji.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5pqaftd49aks0elp184gps3ss3/17814665625.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/jilafalexekatoxezim.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/32c3bab0cc9c2dee3762ad7bb69c2c8a/81763106351.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f404958e1---woxefopalixirami.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8fb79636---3685701547.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/50736115658.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/finuf.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/totevobe.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/lugutatagilipediwoworajov.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/3111141355.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/joxuviba.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/60559972562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=worksheet+mole+problems+chemistry+a+study+of+matter+7.5+answersPDF link annotation
    • 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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 18748 bytes
SHA-256: c55e643db91dca10324d7c752321cf0ad3c9401119609e95864da40f4373a01b
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 11660 bytes
SHA-256: f34a0d479e6219631199324fe9a4f8f24e00bd97e3496478ba115a8161aa2449

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