Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b64c1505823ab7…

MALICIOUS

PDF

129.0 KB Created: 2021-09-04 11:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87cdd8b43667f97c0a289c4d67f24b56 SHA-1: 3e3c2c7a5a94267dbf39c0648a58fe5337b64c00 SHA-256: 82b64c1505823ab73cd07c1973a737733c74494409d5faf4db8f10ca9bea1647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute content, likely malicious, to unsuspecting users. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware delivery via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c8b6288fbe4ac2ef5d723ef21c6535c5/lameposixefonaxamo.pdf In PDF document text
    • http://cuacuonductudong.com/upload/files/sixadobejureme.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/43525469404.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/bifeletobetanodutu.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/12htus1jqifdgpj058c91r4h3e/14711138201.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/zegotanodotusutatu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ef25db6be1d349d9f2c308027ba5c0b0/zixapixepiforejevez.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e693247526e---90233524546.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/92971828685.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/nelabazofumuxugu.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/83286516325.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/4su6n6obue4u3rv04ht7a3tgr0/xogakezofo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fiduzonidakededuzerenuf.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/savezazima.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27dc765a91---84500867892.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/39818607198.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/39071495141.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/xigiritisow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=spiritual+metaphysics+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_off00018765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18765 23656 bytes
SHA-256: e26f6a00a2fb2d3f80e2e675ea6f7497ea14929473fe4e5ad542de28f6df0c4a
font_01_sfnt_off0001c47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C47D 11300 bytes
SHA-256: c8b0a98a9b007fb9178e227098460b85ac88db827484bac99adbd64b2e4e8296
font_02_sfnt_off0001dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1