Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd591ba54c0a79f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 20:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0574cb371955a2462bad4583a39e0eeb SHA-1: 7778729ba92260347ae1b016224bd81adee5683d SHA-256: 6cd591ba54c0a79f7487d3e32cd6626cfc8bfc24b93e4983298785eef9b19bba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=mppsc+notification+2020+pdf PDF link annotation
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/buwofuz.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ie021o9u6c61cdbfq3c1cpjrj5/50065520556.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-27/images/files/24099070680.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/54024848726.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/2466847086.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xutenadakogi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e332862698b---18878847439.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0721a3afa---27350432399.pdfIn PDF document text
    • http://rld-carbon.ru/file/sawojaripiserewaxopo.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/1d586434f425e5251f052ec082670aa5/18396465385.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6c172954---gizevuwowalawaduki.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b88758c80b7e11e968b527b4bb70878f/nafujeja.pdfIn PDF document text
    • http://jump360.co/upload/files/20210626014841.pdfIn PDF document text
    • http://envigest.cz/upload/file/kakurebokixutave.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/zukivofimaxitagis.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/aa299c049aabbaaec2d9317b773bbe7f/vorukem.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609496bce7fb4---90877761895.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/fepogupijekegaxaduwelivon.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e2f6d7ccbebb25619576e7f509139ef7/vejojugiposamerufop.pdfIn PDF document text
    • http://eva.am/files/3efe09c017c80771.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e13d4c764---7855598376.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/23197063015.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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 18268 bytes
SHA-256: ff706b2a3c2c14b365f04cb4d237f3874e4c30a96324bc85bec781f56f8f0106
font_01_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B62 10568 bytes
SHA-256: a068ddfbfee2426e9331babf7ab83c858e7522e0526ddb980205c1ffff66b455

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