Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f09625884019c0…

MALICIOUS

PDF

89.4 KB Created: 2021-09-07 06:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52935f5d32ef2b50108622a00bb37e15 SHA-1: 5f2aa9ba7885116d10f3a31e63015bb2ad519c75 SHA-256: 29f09625884019c05e10b3011bf442ece0638c27d4f0e94d731dd9f13b28a10a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://le-lemniscus-incandescent.fr/ckeditor/upload/files/54966268374.pdf In PDF document text
    • http://jentretiens.ch/uploadimage/gewimobanaserefebanexug.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/72648470959.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/4639673043.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ffe14afb---goxub.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/rezeduji.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/97166055967.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f1efe69f2---31463640288.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/87253556171.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/bajamoroxejulejalesalujif.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca39c784d---labiparisafek.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/74250789264.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f65919712---bawemazubid.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/1897704192.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lidum.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/71926450930.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be2862c4ab1---xifijegupiboxojararebuxox.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/jogifibuzesenuz.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6085353dd13b785fd20356c4b98e2de7/70032105773.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lekimaganefimatojewapi.pdfIn PDF document text
    • http://babamoleskine.com/files/file/xokapivuli.pdfIn PDF document text
    • http://93564497.com/userfiles/51985665949.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/30281748464.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/99735824364.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d499e81f009---minutifomobanid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=data+engineer+books+pdfPDF 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_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 10860 bytes
SHA-256: 10ae88c359f1b3314e5ccc2b8c379ee792a10e7e1419ba7ba3699a1936a5ca87
font_02_sfnt_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 17768 bytes
SHA-256: 932a70241120e42c525b701436008c5401dd2b7f14c01d1c7cc24097c3182c43

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