Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d79acb79687878b…

MALICIOUS

PDF

92.5 KB Created: 2021-09-20 20:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41bac13f5a0b2a56e52dd2aea3a73e19 SHA-1: 99117a432ee68d8ba88615c717c427f55b621e0c SHA-256: 8d79acb79687878be278962a10985546baff7c5df0fe754d401fb069afa523da
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting the document's primary purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://balaji-technology.com/userfiles/file/vigesanelogolevuwu.pdf In PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/61558172169.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136658003e42---36238260509.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/gigabutopigo.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/sawaxerumuxoxu.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/wajamew.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/tewogibevezubokon.pdfIn PDF document text
    • https://suksesunited.com/contents/files/2941127315.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/48372231207.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479c23ef298---83054636723.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/nawivoladogazegajud.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/fogogasalujavebegile.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/73099472962.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/videpevifanefonu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613de626d4914---81135614227.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/nimirisujoni.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/xekirukejifiruliwelovavi.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/wasafelisoj.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/42757410799.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/rarixevofudutobigosopow.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/87859951103.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/nibemiviwomezukerim.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210917_A2417F97B4BB513C.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/gifudes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=movies+online+bollywood+2020PDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pasazar.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_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 17264 bytes
SHA-256: 5a2e926f9f95d4047a455944bfa3b44dcd00f19226646b048717b2a6fe09ddd9
font_01_sfnt_off000133d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE8 10524 bytes
SHA-256: f569931aa8e921e06268d7617ccf0e7811183e475d35310b6ae28ac5d3fe7d44

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