Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd56bf80860f2446…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 18:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4620e13a17f793361a5bc55d8aab49d0 SHA-1: 39d42ccd252e1fdc2a0d1a7e56e82e04b587ec63 SHA-256: fd56bf80860f2446c73ae5d747b040127be7247d53721fea899c3784b86c03a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=comptia+a%2B+1001+and+1002+book+pdf PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/88341339e33218fe4843b7c54fd12abc/55145691505.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/82204002911.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/pibagunuzumebupuzenaw.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/37201e493ee4e6eac36a41384f3b6394/65468180378.pdfIn PDF document text
    • http://epmachine.ru/d/files/tezigusu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d19dc8d9641---puguresazasewilok.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/22545606066.pdfIn PDF document text
    • http://willbramephotography.com/44396836056.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf158f0c0f536b2353039d573acf09c7/43132820089.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/voderilizef.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/feb6ae6ba912ca801ebb88f68295d0c5/xirorexisu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kebexaruvowozefuka.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161000d13e1e21---62581534763.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mq3bplmgnlbqjktord2ji51ko3/kisuja.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe997c9524---logosavupozirajodidunol.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ac7674b6da362b3a6453374e3006cf24/lamukarejomubexeb.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/vuwidokapaluxagupulideb.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/24299195722.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/39740139470.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/11552963280.pdfIn PDF document text
    • http://vaikevai.com/ckfinder/userfiles/files/9514007255.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95859391d---wuxolosatalaseroridupo.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/14025133205.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c98a39c58---wemosifidiw.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 17704 bytes
SHA-256: 79896214e161243beb581b6a89d908993f264b14b4b7cb75e67c4f0885c3f929
font_01_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 10768 bytes
SHA-256: d8194919620026eeac67520e35a8663a51f8ad17ffd25e17e695e16684f3c54b

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