Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2f668fab54967f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 13:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 558059251d05986adc6d1843d6bbfc62 SHA-1: 2c5e29e738e5f1e900a1c68bc3dc5fdc1cac9f1e SHA-256: 6b2f668fab54967f8586eb0b96fe812586e356ebc3b46781544bc540d739ed06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://nomylo.ru/uplcv?utm_term=mehndi+designs+on+paper+with+pencil+pdf PDF link annotation
    • https://brihat-group.com/assets/userfiles/files/2145687328.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/6745552159.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607982ba84433---zalofusezur.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/20381131128.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/iqjq0iq2lpildgejeako5a8c8n/42500558036.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/fisamarugupofov.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88605ee12---37097276376.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d82ba3aaa3730adab2d88add3096fce1/46687202335.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rsmp1pgdfe0e2657tedlr39ju5/wulitagigadela.pdfIn PDF document text
    • https://alutat.com/data/file/19270796663.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/41135403247.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210705192853_w3isth.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/o8peho6j7all08pto0slgqe5h1/butoguzulexesezixurat.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/bavijalesobowafifisesuguv.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/72mgkprfo213scpf6qdau3dlrj/71842355983.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/salafemaxa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/vorisenivafegepixituzuko.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8709ff350f---vemegimorizuzo.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/99209207288.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/63896871917.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16076e69f7452c---bibom.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/bupevisexazelat.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/bulojilojokowevuwowu.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/96116190102.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7706873b6e---fepafejezazuderuxag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 10976 bytes
SHA-256: 1549eabea8409daff95d3b1f938de0daa5ccc9e988352318c643f243f81896ca
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 17656 bytes
SHA-256: 9857c90cf4a04bb95a0561c4ad2cc0ca7f6129ce4500ff27e90e04a0c7a04c3a
font_03_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 16816 bytes
SHA-256: ec251f6733b1117aec9f4618713259ec9b232f9124ab32e6c585eac45533a595

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