Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e2e3e32743273e…

MALICIOUS

PDF

95.4 KB Created: 2021-09-11 14:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7db86f1ab8189df4fdddcf1c451141a SHA-1: ff49970cec9ace57fbe97ebe350a770d9ce59ad2 SHA-256: 72e2e3e32743273e3f330af2b3386883ebb0b9591ef73cb1362cb86d834f14fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the link farm nature is evident from heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pistant.ru/uplcv?utm_term=best+dirty+adult+jokes PDF link annotation
    • http://hanifeugur.com/image/files/rokenufijup.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/44175593897.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/batorov.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/77809499282.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c3220ac3---sodazetadevigevobuwutig.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5d3b7cf9---74588844755.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zumidexezeroralilorokupus.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/dewijimetaduv.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/42042093896.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/zonatidotame.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/imdc0fgf8oc72vcovvq31136p3/39299774.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/fibil.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/88083907502.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/wuvebalikawanufuruxemotam.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/wujukokiwukobilifop.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/91976507967.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jonafafadetemujorup.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/melalase.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/71537037314.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/notovisosatefexazuwowoko.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/26198839755.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/fodorugekatumidajalobisad.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_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 19476 bytes
SHA-256: d8b64f8c4985fceed38fcae83f488e472076f89925f941b05aa2c525aa29ff35
font_01_sfnt_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 10628 bytes
SHA-256: 7f5ceb3298e403a9cbbd4dd01b43bef68217a1e662159a19dac360c63f246fdd
font_02_sfnt_off000157de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1