Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7fbb40cbc68cc5…

MALICIOUS

PDF

95.5 KB Created: 2021-07-15 09:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f89ccb228b8a0b96973abd1bfca7d69 SHA-1: bdc392dcb2ecbe9a29966336bdb2c4f49436f211 SHA-256: 6c7fbb40cbc68cc511f8a7a25d3115446a54a90dee2da325007630701b98e36d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress installations or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the malicious destination through a network of intermediary links. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://portalcom-b2b.es/img/user///file/_0121121001626330114.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1hg81vt54m41sp8hlhch55rjq0/54094376285.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tipuzixiruvirujanukavug.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e137576d33---rufadosedenogosi.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/78889960410.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a59aa41ab---35963101940.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbf439961---88351055629.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/dumokerupupezetegugivij.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/57030419621.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/9160755789.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/910a2ea52b163cfb001840dced42d420/95309517863.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/87dc88ae4b62049e6f7422b58271004e/49984418996.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/ninovanizajajosufu.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd3bab24ea---wazuwid.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609339fdd2a62---norogasuzijebe.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb83e4201e---bafalomobo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76288149b---vugerugapule.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/65b3281e470302705c067277de1a645f/10944396180.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/rutinokuparebeba.pdfIn PDF document text
    • https://akemi.ro/hirek/file/25167710745.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/35186277642.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u2uvh75g3eg0jaqnht4fpk5tft/tipiwore.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/8453652467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+refreeze+smoked+meatPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000151bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x151BD 18988 bytes
SHA-256: d319bd98a2bab8a3f9b046c49290ae3d28194f3226e76063491d16d1802cb30d
font_00_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 18296 bytes
SHA-256: abd46ae7a558c65cf19697b26888806e7d46ced3c673f0b88eefba949b4fd0f8
font_01_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 10772 bytes
SHA-256: 41398b9604d52cef1a8dece4b1d8e966aa9d0dbaae62091bd5ddc826949fca7b
font_02_sfnt_off000139ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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