Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0340b5e03f68b5b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 21:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c7628b55dc1181d96d7ea74ad9a43ac SHA-1: 03c32e0ce29f7712923192c05f924c93aa437c23 SHA-256: b0340b5e03f68b5b113453d152a05a782232690901e156b013da70a0177417bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

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://chcial.ru/uplcv?utm_term=information+technology+project+management+8th+ed+pdf PDF link annotation
    • https://mygoaltv.com/ipp/images/uploads/files/siruxunar.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/46556458695.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210828044418.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/soduwobokolox.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/bs4h899lhkvf0s16aivm4q8u2s/xagexidepozolakexip.pdfIn PDF document text
    • http://rayanchem.com/d/files/13907811321.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/lufuzosimupezigiru.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/20162192816.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/52067610612.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/11861796904.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16115274457177---95516400066.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/13479195320.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/77016426547.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/bojifutesugivujinawokexus.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/30892341866.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e9f86f00683780a319a4250f7bfdc6a7/lejurow.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/17705399612.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab83759f99---tinowifojuliba.pdfIn PDF document text
    • http://rafaelokazakov.com/file/wamovukikidixexizukiwu.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/voseroramamimekidur.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dba4e82f78754138a5c91269d48eefa3/86114470437.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f5eaccf38f5240cc8af1963efaaedb6/61848303110.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/walevedesebedamipawonex.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///18791791329.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/24205995051.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_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 16724 bytes
SHA-256: 429ce342b5116382d0eb133702f9cbc6870f12f38985f04c6f73924e7b13f2f3
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 11300 bytes
SHA-256: 5aae95d9496715f4532d13398188ee94c68dc9e2117df2f034ec6cbd1b90bc5b
font_02_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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