Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a1b98c27f03a05…

MALICIOUS

PDF

69.8 KB Created: 2021-09-04 10:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0778aa90407504648317ed0a01282a1f SHA-1: 5ccee586b6c0d88bc990a43a8ca7be5dfe126c51 SHA-256: 93a1b98c27f03a05eead5ff3a5b67ec05d54bc0211a15c5c2cfe81bdeebcd2c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://apsons.eu/files/file/72633875980.pdf In PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/59ec3841fcbdec6956ff8f09290f77a4/28302899643.pdfIn PDF document text
    • https://csn-alliance.com/data/files/semubewipisuras.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/nixigawolovuzofo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/cc99aaa597616100cf221bf3858e5823/79387581441.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1siurlpi0lm7828qb4blji24b5/78231910081.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/xobegitogevijipanoxuluv.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/57689670037.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/kolobinokij.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266fc1e8b50---xadetuletimewasojenefa.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/18f8bfc63cc012c62d700812f225e515/30206781140.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/kawapepogulaleg.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c44620be6---kiwajimilazaxof.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/noxewegelujapugadawugemow.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhkdbjq79el7bjitkb26s9f3nj/47050215558.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4824ec3f39---23788252402.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/11041173576.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/86564330513.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/genavabotopixarekisibi.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/49440649997.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ef4939943aa5ce8355610391a1917e82/tawipifinonaduwelifilo.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/57118937413.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/97218978542.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/93662483609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pooling+of+interest+method+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_off0000b480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 10784 bytes
SHA-256: f5da9e384e23df8c7d52f249b21907bab003faf9e2645f730a8e96241874d564
font_02_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 14640 bytes
SHA-256: b72313469f1144cab7bb77e1c6cc4ff00944e76f3142a239ee0381f9a1cd8492