Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a1b5cba6f1e49f…

MALICIOUS

PDF

90.2 KB Created: 2021-07-23 00:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e073d65bff784709b3488ff9275e095 SHA-1: 7ee0d76f20fc49158acda60ba6a01fb11bf3ffdd SHA-256: 57a1b5cba6f1e49ff71f4f0cfffe2899f71538f9307a5379b2eb49b7e8adb679
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c430ae13---lutitidiv.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e0af5b8cafa6a4c9a53d7c824e8811de/64071178752.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160859ec87ccc6---seniwepumilivodagogoluxiv.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/13809087336.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lujakegikenupuwejobunere.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba44a9740ec---gevuvojovuxa.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/10803713750.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xugaziponapexokeludux.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0ca68852---58456665436.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/gasodedapaw.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/39654070585.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/zanukexosinokomup.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/94fa7853697c7fb82f33950ee695748a/95629823609.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/pizeniwawerux.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0758bcaec4---55144669269.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d6647cc8---vanirovevek.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/70123242318.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b28356c9f35---rojekeduvaz.pdfIn PDF document text
    • https://seerupit.dk/assens/file/waxapadowebugi.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/99pn530m3vr4dc0qpbeo8d1171/keletuwik.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/435902137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=music+for+writing+essaysPDF link annotation
    • 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_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 17456 bytes
SHA-256: 1ca03c1d08d3dab6856efa6e73ccd4e35d18829fa9e76bc9486c2410555c0262
font_01_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14225 10756 bytes
SHA-256: 9f80788af9aa4568617680c857176362dbfd2469ab13ac9ea0ef43a546d6d75b

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