Malicious PDF — malware analysis report

Static analysis result for SHA-256 de755763643b6c1b…

MALICIOUS

PDF

90.4 KB Created: 2021-06-29 10:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fa5981c2c9ca5168d3073bc7062a1d3 SHA-1: 58b16c306e4454f8251c8bb25ccb189c1c173bd1 SHA-256: de755763643b6c1bce6206e752241f823b9c4e238d777e008f99a7209b4b1f45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=the+catacombs+dark+souls
    • https://sportsht.com/userfiles/file/21070572740.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a53325abc4afe8f86a6989e00ace9035/89148645702.pdf
    • https://escaletravel.com/userfiles/files/11198432375.pdf
    • http://restravel.ru/ckfinder/userfiles/files/nujipisifumamin.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/eb0383f4386a8ae8fe58c5288a6c2f33/77660839377.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/59663464470.pdf
    • http://mini-garden.ru/userfiles/file/tadiwupiso.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/549227cb646ffac7f52c85ef93cdf034/visivivumubibaju.pdf
    • http://angarakshaksecurity.com/userfiles/file/fobamudinanupawuwiramebu.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a82474df5d71aceb3300e003b16613f5/7736840825.pdf
    • http://hilimall.ae/uploads/files/xemataberifedabadasafi.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ec76caa9f---wibabukazitit.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5507735a1---kanuwud.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6c53c8f0ab3c1e531894d0826cb3321d/77680247431.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b9d0cc67a78b5f41107d014b164fe0dd/tovukev.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2057a5ba6---41297120152.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9131ce78f---mupefibamumilafilone.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d22f47a31---pasaretowurozagosuzezuti.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/66726867241.pdf
    • https://amitadevnani.com/userfiles/file/51197988938.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6a.bin
a14a43f0f92a12e1cbef8e1dbcbe48cea202b8b4cd2b2104d918d33cb6466d55
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 17676 bytes
font_01_sfnt_off00012bbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 16792 bytes
font_02_sfnt_off000143d3.bin
17a1032ba578adb8984b25808184e24f962dd9fe64100b57b20fc047db388020
pdf-font-stream PDF embedded font (sfnt) at offset 0x143D3 10732 bytes