Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5142fec9c7794bc…

MALICIOUS

PDF

81.4 KB Created: 2021-08-18 11:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a67605be5b51f5f2fba755cc3b524e9 SHA-1: eb0becf04ab370e44d4d7e042623b91ca0dbcf61 SHA-256: d5142fec9c7794bc62352d32c3b4c4bf7e0cf51fb4fc04962a303260f917bea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The primary intent appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=examen+de+simulaci%C3%B3n+comipems+2018+gratis PDF link annotation
    • https://alatheir.com/atheirwsfiles/file/mobogezibaja.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5760a5b1ab---41943153382.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/47147527243.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ubi3lpqu911r9pbnhpn7tp6kn2/92597376287.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/50978887692.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/bumozatitafuwag.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/muwapinirisowu.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/varipawor.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/41582273315.pdfIn PDF document text
    • http://15881588.com/ckupload/files/xugebigemoka.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/64449265057.pdfIn PDF document text
    • http://praguetransfer.com/files/file/24844838723.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d52b9c28f2ab42026eeae1d574df7851/72359867923.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/07o21acl77tc8m2i9pidi1l9u2/kumivozonoxel.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forawomefete.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161051d8ae8cc1---ritumolazumesid.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b63cfad5a5fff729566a1718abf0ead/virovovuweregevaneleg.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffaba4986---7016611613.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nararetinaxa.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/7545593183.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/4256344230.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 16672 bytes
SHA-256: 1af0966a484352c2e04966d3ba8c165923745d294403ac910df04739d86f78ad
font_01_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_03_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 11684 bytes
SHA-256: b026b892d3031a99f28f7bef4204b1be3dd40b47470636118217b8195ef3e013

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