Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ded7ef6660dd36…

MALICIOUS

PDF

81.1 KB Created: 2021-09-25 11:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f05df36875cfceec11f72b471155b5a8 SHA-1: ff841becee0cfb1f861e2b584daaa4612ceb4134 SHA-256: 63ded7ef6660dd3699b333e137411abc77177fbc987d0a87b528fff0f2af6b5a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=programy+do+obr%C3%B3bki+zdj%C4%99%C4%87+na+androida PDF link annotation
    • http://caerulumpharma.com/upload/files/57806912586.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/sufura.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/972d5779ad7f5c00f531f18b5b5208c1/nisozabadakaselisolo.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631508589.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210909055335_560vj8.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e14651fcdee3345a4df1db2ec3a155c7/65425342456.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/tuzelawiwofu.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wajakajugujidizana.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/28319712881.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/62986605634.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/76511021145.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161435e9f7f66f---50746370290.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/funejitixer.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kiwuvigo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161364303c09a2---45998979219.pdfIn PDF document text
    • http://tzsunup.com/upload/40786209635.pdfIn PDF document text
    • https://jensbrode.de/files/file/zuzafufanedinad.pdfIn PDF document text
    • http://farashimirooz.com/files/621152176.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/54226697462.pdfIn PDF document text
    • https://reniuved.it/file/jepuporafegekukuxarunurev.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/xoxotovoxifotelawon.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/vumatemapuzigubexalu.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/tuwituvizikejovawem.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/5571933031.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/kofexupumesenera.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 17512 bytes
SHA-256: 4cceddd272c21396a475d1114ee1620c1569d4f780c6479f8e83aee9d3cb85d1
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 11168 bytes
SHA-256: 858d4d480ed7889b5c91fbca434f2c559c947e3181b2e40479f5414ada83a9c4