Malicious PDF — malware analysis report

Static analysis result for SHA-256 a280b5063ac45f56…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 16:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c68320471a7b982f1b86c6027d80148d SHA-1: f653456423959cd8b67530fcadf74f67b2085335 SHA-256: a280b5063ac45f56f0f15b2f1f4825cdc37a56421b88f67bf1f067a74fa666fe
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=savonius+wind+turbine+pdf', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=savonius+wind+turbine+pdf PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708c63fd92---wuromosogefokad.pdfIn PDF document text
    • https://85097781.com/upload/files/xalorebinawoden.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f87214d5b---83713975950.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/pegakajepopidarilabemufub.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/37027297892.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/17013677418.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/15313211792.pdfIn PDF document text
    • http://slsnn.ru/content/files/wepamemepaba.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/27443693562.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/45100347170.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8870393d9---98031072190.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5238d7401a---xaxujutakakedosali.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/58657068184.pdfIn PDF document text
    • http://psmpetcare.com/clients/76030/File/wajonebodanuvab.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b364d1d2991---54658474513.pdfIn PDF document text
    • http://synowka.pl/galeria/file/gomujaxipojomogajodox.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/wigamixe.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jumuvalazigobegol.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/68605897903.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c12268dd2---48258815330.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b739a40d28fc5bc3e1f69f12cedace3c/39619548277.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a379ef21f97---25683946986.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/epfmd8brka818agn5gjtst80j4/63587213310.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nubudoz.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_off0000c16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 16148 bytes
SHA-256: 07831b412f830f2919a72ba304adc4220006c07d0c8acb57c055a3d4587bcef2
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 10912 bytes
SHA-256: 8e79bda79bca283fdab738d6d1389d018f3d1aaf4fa3ba0b1e1b3f60081f1de9

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