Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6bb0b8680f16f5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-10 17:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 680db394e7a0e1e83f1a6e996737ed64 SHA-1: 61abc377d499225df68be8dc3ba52ffc79ada180 SHA-256: bd6bb0b8680f16f5c5c21e96fe92279289b7e06cf5817a5386632aa6da6d3342
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading potentially unwanted or harmful software, as suggested by the 'reaver+for+android+apk' UTM parameter in one of the URLs. The presence of multiple link farms on compromised CMS uploads further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=reaver+for+android+apk PDF link annotation
    • http://mkconline.com/landmark/ckfinder/userfiles/files/dodalizarunij.pdfIn PDF document text
    • http://enewind.com/pliki/file/79760550626.pdfIn PDF document text
    • http://indexone.ru/upload/file/vazefozodovujadozuvitan.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/mapaputuk.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd644c2b8---67721178454.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gifefisuritoretej.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/23715548684.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/39238052515.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee27c7b8c---fuditopezesilo.pdfIn PDF document text
    • http://thepducphat.com/upload/files/46069133646.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/wujiretoledenop.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/ratuxanak.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/29328540868.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/nekira.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/xozolutuxaxafadigona.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/53145065127.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/75596978718.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/75496155350.pdfIn PDF document text
    • http://beiks.info/public/file/xesegule.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/68119447553.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/92478123959.pdfIn PDF document text
    • https://mimpidia.com/contents/files/sevixelakolifarupeb.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8701bf4c3---tesobukutetado.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/naxibuxugamubafosagin.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_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10384 bytes
SHA-256: 86b35ce3306d047e6d414f23bdac71e07d0cacf58b6eedc7de55ec33a755c590
font_02_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 17332 bytes
SHA-256: c6b70d047fd28ff7ea75d6cea4d49a98b82ae0684d6108d1d5960ee23247c6a3

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