Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e74db2446985ab…

MALICIOUS

PDF

74.0 KB Created: 2021-09-03 08:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4667ecf6e04f9dfed67aebd856d3bbc9 SHA-1: 8769467167deb2d057c3f79eff88fba03ea7d575 SHA-256: f8e74db2446985ab9fdc0a986303143dc47206bfb95c1acf7faa030fa5565414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS upload directories. The embedded URLs suggest a phishing or credential harvesting campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=clasificacion+de+los+hipoglucemiantes+orales.+pdf PDF link annotation
    • http://cpbnatation.fr/fckeditor/userfiles/file/rokuvesifexefosod.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/00433a62a558dac78715d17340cd2797/67317666854.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b31ee31a7---41196340111.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/ribujepop.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c4614d938d79367eb1f19c75cb75db0f/71750953573.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c512d59a4d---14407589612.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d425913d---fewufuzeregukewomezabetar.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e85d593dcd4e8e12c6c4479f16b52f27/jokogudunamebewuneza.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/89781834939.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/vuxum.pdfIn PDF document text
    • http://garderoba.sk/images/_file/nasepobegojedi.pdfIn PDF document text
    • http://micruts.org/userfiles/file/buxonul.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7934626b882137f342931a38511ed39d/76184268629.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/3239724377.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/42857751944.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ql2plo2vtrootmklpc6vuvh455/volakuwigo.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/dunijawetojumugibijidolex.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070763c95a91---lizijuzojulop.pdfIn PDF document text
    • https://datajournonepal.org/files/35011619152.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/wofafugajug.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/bomixigilazepem.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab29d3126---vepinad.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b0078741---gumozepul.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_off0000bada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADA 17800 bytes
SHA-256: f4a2b3f3d0e06081d2007ddd8c8b33fdba3b4c7fb1dd009a124215eca87222d2
font_01_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 11264 bytes
SHA-256: 7bcf2a28ba496f24bc6d47049764feb75613ef165e336a7775d18508a6db8308

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