Malicious PDF — malware analysis report

Static analysis result for SHA-256 6753e2286d7015cc…

MALICIOUS

PDF

75.2 KB Created: 2021-09-26 03:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcff0a09f6e240717c7275e2b33502e2 SHA-1: e9929fa2835fe5b81eacad5dfa8654e61fee9bdf SHA-256: 6753e2286d7015cc7ba7b486ddbd7d8e266ae4c43439eb3a2b3215ad9cf73230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=furniture+mod+for+minecraft+android
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614750ea5158b---sazopo.pdf
    • http://kayapalinakliyat.net/file/10027297760.pdf
    • http://bakefruit.com/uploads/files/202109100431193358.pdf
    • http://mrcookie.tw/upload/editor/file/161821237952.pdf
    • http://ylplj.com/ckfinder/userfiles/files/sazemusowun.pdf
    • https://clap-bas.com/userfiles/file/22947421326.pdf
    • http://juha.be/_files/file/10605939000.pdf
    • https://eagle-aviation.com/userfiles/files/somovewetojamole.pdf
    • http://jinruily.com/UploadFile/file/20210925062838577.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/gebufaxapunapazubujewuguj.pdf
    • http://alpha-th.com/userfiles/file/figuwezevosivuzuf.pdf
    • https://synersys.fr/contenu/file/zowadugoxoroduxemud.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/fec85063ced16aab80b48176b30faa28/nirunemilijulabo.pdf
    • http://wxmx.cn/upload/ckimg/files/202109050926395958.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/83846237174.pdf
    • http://trinitysportsandleisure.ie/userfiles/file/lisoko.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/govejezelo.pdf
    • http://tianfonmm.com/d/files/jifozi.pdf
    • http://hostingureitings.lv/uploads/userfiles/files/66511895309.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/lewigunuzezu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6oe320s4sgbo3g4s8sp7h4npo4/niwaxabig.pdf
    • https://qnzar.com/files/renikuluravefuzume.pdf
    • http://sigmabhp.pl/userfiles/file/janorijopana.pdf
    • https://tedesco.pl/userfiles/file/jesawateveritiraledak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF41 16792 bytes
font_01_sfnt_off0000d753.bin
5b9a003d15be2b0b7054f72dcf89521c4ba21052ff760d736d8676fd600acf57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 18852 bytes
font_02_sfnt_off00010717.bin
813c691af377dcda31dc9476b6ef54bcfe5bfbe17754df17d93f1ece63220862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 10500 bytes

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