Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bdc1b29281afa5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-22 23:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5f4da67ebe17884c297d02d1d1e287f SHA-1: b55847bdd0eb3cea91ca4d7f6d8c89f95dabc74d SHA-256: 86bdc1b29281afa55532a012b4501be9902f785d1f03943709b72f32b2b9d200
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://marblobaths.ph/app/webroot/img/files/44602474805.pdf In PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/899880179.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/72063397897.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109042346424823.pdfIn PDF document text
    • http://wmsone.com/eimages/file/41061573566.pdfIn PDF document text
    • http://trevorhannant.com/29516210028.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/44776036053.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce20e9251a---rifotobevum.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/86709517699.pdfIn PDF document text
    • https://wsbtitan.com/images/file/36523562906.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/buvuwanumireligujagademab.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/gexadon.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/dipozili.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/16128004242.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/21450632807.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/rejineburep.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bfbc7b518---67268147226.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/79475860623.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/jitifivinadijukubib.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141564967484---73423512299.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93379741891.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc8f946d7---98024266899.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/74904921273.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kobamakeduviboturak.pdfIn PDF document text
    • http://elitacasa.it/images/file/92106158694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=too+much+tnt+mod+minecraft+download+apkPDF 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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 18128 bytes
SHA-256: 44553ec6f0670c85f32876352983d13d25872687273eff771754b28d7549b2be
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 10960 bytes
SHA-256: 5878219fb09539b193362f366e280ac61e0755988476bb1e230b28acfdb33a3e
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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