Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc8abcc72f02070…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 20:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1a1d027c0185902feb81ea00d3d237c6 SHA-1: aad876c721d21dc7e0308312ca040712181f8692 SHA-256: abc8abcc72f02070bde7c86555d1d8e8965f881804cdc0f7aa3333c714d25a8b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing. The 'SE_MFA_LURE' heuristic indicates the document's content is designed to trick users into providing sensitive information, likely related to multi-factor authentication. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://crewmak.ru/uplcv?utm_term=how+to+recover+deleted+notes+in+android PDF link annotation
    • https://dianthusindustrial.com/resimler/files/vezinadewurozofebaj.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/bowefajenejalexefat.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/29436798850.pdfIn PDF document text
    • https://mklaassen.nl/images/file/69632111509.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/sasoxeputibuk.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/megukapagomazori.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/badubomefugoxadadidor.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/vimefosizotuvad.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bf3af412---napitisesejokodoga.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/37615757453.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/jopuranevana.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/jozokugixufijibusev.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/kukasekerujatoforanenogo.pdfIn PDF document text
    • https://adikketiga.com/contents/files/lapogesaxunute.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7fkj9dmkg3bqfinum39p53j8fk/86852420267.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/75431932871.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/volatumam.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/ribopolaretimizisat.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fofoveja.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/batixuzugekekib.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/xogavarobamulovefovu.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/40055923682.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c81994bb9e---mezijomegenivi.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_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 17864 bytes
SHA-256: 89ce7d54edbc2fa595460885c3e3782f22beed38ee00f1b4a49d35708fb9a388
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 10508 bytes
SHA-256: 60fe585e561a5721d5ef745e28af982f7c17b65344f22d496ed525086613fde9

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