Malicious PDF — malware analysis report

Static analysis result for SHA-256 88068a251923c66a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 13:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9427aad3669ce144ab5825401fa7090 SHA-1: 3148fc5577432360b2a0a40adbc547aec3f23d6f SHA-256: 88068a251923c66a388ea7891ae5dbeefded67fd69b5c81bf8af6142570a557d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=speed+vs+velocity+graph PDF link annotation
    • https://journalofcritique.com/ckdosyalari/upload/files/jusosamevagu.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/vunifurel.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630785953.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/kikapasowixamapulalirem.pdfIn PDF document text
    • http://usateatop.com/_upload/files/xadeb.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/o6th6s8rmvg2kfoqmlfhdfro4h/waruwomidaleru.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c3ba798256e4f55e7fc78c4ca634b15d/xiwibejixubuwa.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/50920307369.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/5750686779.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/jofasixaluvove.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/91983183012.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/93972802140.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210906_503A190B68317F5F.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e989794149---bedaganutowoxipelafego.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/83476415841.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wodojofujowovufododeri.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/japagorigevilifozap.pdfIn PDF document text
    • http://eurosolar.cz/res/file/83567400646.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/94880510219.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/wipunajosalidunoza.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wimano.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/firoragagutegipikebobesi.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/21498426706.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/jofumakusosonazored.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 18148 bytes
SHA-256: 97666374f0132a76c22411ddc6cb1d27a16b8a6e6e08f47ccac66e98df1ab390
font_02_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 10944 bytes
SHA-256: e74ab8ea0803f1d1dbaffde3193dae5cbaa3d5f7759e4df4c92cd574032df62d

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