Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd65790b442ea05…

MALICIOUS

PDF

83.4 KB Created: 2021-06-28 05:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 71a9a600ba77ca61a0a4d705f8c3b956 SHA-1: 94df916f37b4221f2f0d8837983b8a2c600e01c1 SHA-256: fbd65790b442ea058c10ae27671565be32946b9a89b01a4fae43b358fe31def7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=sequestration+in+court PDF link annotation
    • http://asustainable.com/global/file/podibiwitugakelalobo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e03044a93fad7ab0f5cf1d0856249110/67341508051.pdfIn PDF document text
    • http://teresachild.com/upload/files/81400821236.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93081a21c91a72110f5d449c02967574/82227215339.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/mewupotodujag.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/2576131117.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/1672626842.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d84f049e---mewekukozugenasevefe.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/62701547669.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609613c08d64e---72835525779.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec95cde920---gafakijuzifa.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/86939639109.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6e94d52a99fb826026f6d91b940343b5/rirokagiwubidulezuziv.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f547c17b026c30a0f0ce22deb1973faf/87949685288.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2e3170b3123fc93f8d532396f8e9d01d/12746159791.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/bugagutokuniwexagixav.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/65b0abf1675ae983bb8f3d81e5145c98/pisuwuwojidomuduwirorexi.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/33061909161.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609662c383c22---41573531701.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99c99d383---tugaxipomaxomoforuxib.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3512cb60e71fc8bd9544837add5a2c4/82944073190.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037f115b11---suvinunodizof.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607964e9d11d8---zafeforosufisox.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/61dda71093b2b0fc99f62f1b551b39ce/lorosukusekorajiwebufe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97604607e---subepabimafarixipodagu.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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10500 bytes
SHA-256: f92dee231d44247fd340192e395844c8bdda354a3173816967c2d1620ac384e1
font_02_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 16960 bytes
SHA-256: 51d78d2b92a1328379b1f81b84b25e955667b2f05ed125b24e0787c4855e03da

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