Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b648fa79de81841…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 06:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d434e0858b42d413250b8575791a2c8 SHA-1: 7f0ebff4daf05bce1329655d4608f80fffe45fd2 SHA-256: 3b648fa79de81841bdc2edc89832d3bfbb7f7271f0dfaec7e8dd13b8d18b5211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/acfd8305bbebdf3e5dbbfe55f88e2d01/15272922985.pdf In PDF document text
    • https://fonixkoncert.hu/upload/file/fadupemiruninag.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jigijekalelukoru.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/zeboxilabajusudu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/s2so6f0dmkguv7g9occ9e3hv1k/58376678134.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb6583b618de20505d6545291ff8a22f/dejovipovatujor.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/94466471582.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160939efadc209---96092091496.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/6761010781.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/663862677.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6171df1972aa4f7ac3a620dbb5ee68fd/66611796688.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210618212550_enl4dg.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210825_180034.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/78556733577.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6d600459---78104082519.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de2271f8b---kosozafenizazam.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/ragedigopevatejakuged.pdfIn PDF document text
    • https://btegypt.com/file/42665788334.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/5111767233.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89789135b---18685279908.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da14bf291e---16426633005.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1559c06b---65825180774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=archdiocesan+shrine+of+our+lady+of+guadalupePDF 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_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 19804 bytes
SHA-256: 60ec593d0c00a0ed6cf059500497b28db7f2e4c4629b2c9af20e5d5c44685ff5
font_01_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 10996 bytes
SHA-256: 1b628ab605d9e6eaed458da1baea2348d8f7f6b8c2996053ffeafcfb935a78a0

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