Malicious PDF — malware analysis report

Static analysis result for SHA-256 43589f67658bb908…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 09:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a4289f33fd8f1517403b345e6f040fa SHA-1: 5f1639323f70b0b56a6d282847ebb6327afba5aa SHA-256: 43589f67658bb9086774677f707fb55ed9814249b1ee08e230861f118378dc4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=food+medication+interactions+18th+edition+pdf PDF link annotation
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/96498846084.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/naronatutuziregebuz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f514bd95bb---funawikiretumudimatep.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/11994378917.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210914185212.pdfIn PDF document text
    • http://japhina.com/upload/file/zejikiburulawamipusilo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/kidupiseraruvunorube.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906162113_d602bt.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/tagulopopu.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/dimuna.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/31734789382.pdfIn PDF document text
    • http://szm.hu/userfiles/file/51905685712.pdfIn PDF document text
    • http://sooclose.eu/upload/File/zanawifabimifewixo.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/43518314140.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b3a89db5---36529477558.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/tomoxuluratinebemukejow.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/xeraxo.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/6110860417.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/9411480660.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/giduwinokibo.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/38617953236.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d3bbcabf---21586568984.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/masitoxomumikitonulok.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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 17696 bytes
SHA-256: 70529a6d6af34b68d1d3faaf6ee7dcb2ca09fa2f1dd70490a97284382c09d4f4
font_01_sfnt_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 11076 bytes
SHA-256: c6d0d9ffb3b5902b9b2f9f72ff15cf118f3a4cca04fb237085f658d27a400d5c
font_02_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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