Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7baaf3d124e4ff…

MALICIOUS

PDF

120.1 KB Created: 2021-07-30 12:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44c8ddfbbcb447e4fb3328624cec294c SHA-1: f21f03b90370e06412d87b34ef799b9e996e5767 SHA-256: 3a7baaf3d124e4ffb538e9b4d7d30093ffaa42942997b0e446165cb4f6135aca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure suggests a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/kinidbts1hbphni9ma7nm02ijf/75588155394.pdf In PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2d915218f2f8476ceb013e5e35c4651/zeduxewesifetufaduvutibi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/099246fcf570c47e119c3753639b336e/74250892176.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c068a10ce5a44fc059d8c5f71e3d4f75/juzetiboxunudunukevubawal.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1097cc5bdd---34011919110.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23a22d2e8---77829634049.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095113b9a183---rijetisirefemufa.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/85256503441.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kekaramogigogado.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/repolovesinunolegukos.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/52089576740.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd15f4de5a---41734937697.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5b851726a3543823188518b77380bf20/dovutidaluxujidu.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/tekipozag.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/18649144179.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/973b27f0eaff77d4db4d257661980c75/41285676401.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/wosufenibobegofoxifixenu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b35e6b064---rugelubanesofitag.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080336687ef9---3713378480.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/20263914379.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4a9dc6c9---85968128731.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/78507746958.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210613012115.pdfIn PDF document text
    • https://petikdaun.com/contents//files/gutijerudebideb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=why+does+my+dyson+airwrap+keeps+shutting+offPDF 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_off0001721a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1721A 11284 bytes
SHA-256: 48f71a47e930530c212c77a9f4fed3a692cf907f06317fbbdec42310c1475f33
font_01_sfnt_off00018c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A45B 17328 bytes
SHA-256: c5385b150970dd24883123ac7405da0fcce99796f8258482729df7165d98a581

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