Malicious PDF — malware analysis report

Static analysis result for SHA-256 367780d5d9de08a6…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 19:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c66906a78be5a9a98a5a99d8b0b6ed4 SHA-1: 509653d5bfb673d8ca71b66c56524a7e1e80b4e8 SHA-256: 367780d5d9de08a6365b4c57486096b31d6f88a0b33b07cdd261c63cb6fb7491
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to potentially compromised websites or IP addresses. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to distribute malicious content or conduct phishing through a network of linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://keluargamimpi.com/contents/files/95774611364.pdf In PDF document text
    • http://fundacjahfg.pl/upload/file/97539767816.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/52201357564.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/pezujugafevute.pdfIn PDF document text
    • http://acril.ru/ufiles/files/54155869150.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631468127.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/putanusegukowosikobuz.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wegojibujerovipoxulegov.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148341e7fda3---3978336371.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/18683617853.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16142119d7d559---nexokexiwuresuxunu.pdfPDF link annotation
    • http://aguito.madteam.net/ckfinder/userfiles/files/47267236994.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/22748224471.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/31385b9f68eccb74bf4afa966cd9ee1a/nuliwigubeba.pdfIn PDF document text
    • http://cy2hand.com/userfiles/68498724726.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/52130194370.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/18417721353.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/nasakidetefewobagufem.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/toxafusugexizasixijujix.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/28527101350.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/13206617365.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/gufilinefovo.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/dilalebatepojirexilu.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210918_BC0FEEDC1B550A03.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/bodel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=crisis+action+mod+apk+unlimited+diamond+2021PDF 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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 11192 bytes
SHA-256: 3b7765bf7cb145e92e701c731b634584d460324a2be33630eb901e435f3b110e
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 16408 bytes
SHA-256: 197757fb1b92779a87be3440fc96ba94909209bc47c9d8594a98de8d0f6190fd
font_02_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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