Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed4c2f7d150fd23…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 18:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52de2d935b62fd7286eb5a2ed6221d9c SHA-1: 9e600c87425c4e1744a4e3412e766325edc07d68 SHA-256: fed4c2f7d150fd23f7e237166a8dd70653f124b7f3eec5e5a1534e13949af15d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS upload directories or are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://medob.org/SITE/files/editor/file/11417208439.pdf In PDF document text
    • http://celcg.pl/uploaded/file/gixesumi.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/kigakufu.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/zawazozi.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/37793382867.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d50020c4---filap.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///26152723903.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5f7369211da9004c48029e1abc17b1c8/95206126820.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/nitul.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6c9f981e78a4b123bb1fb003926fe51/redelurunuvezilupema.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/vularisaguzitava.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/tolewa.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85c05219---23386774690.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/jinokuti.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/29552765194.pdfIn PDF document text
    • https://beaszemin.com/files/12458025020.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4855e4434---wivejejusepoxinilusiwopab.pdfIn PDF document text
    • https://activepymes.com/pub/file/mewusunog.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/rorep.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437a697abf---29045889919.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/bosigapofewupevowemi.pdfIn PDF document text
    • https://clove7.com/userfiles/file/varazipapumevikivi.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/63209781554.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785866c19b3---62167856955.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gidofikokupalurisafon.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/67999087149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=inferencia+estadistica+pdf+libroPDF 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_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 10704 bytes
SHA-256: 9b420fce3eaf77975fb72ff78a113fed60ee152392a3c0d846233d60c379060d
font_02_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 16988 bytes
SHA-256: 700285124cbcd075be814d70988b74d122b207ad8676db78a24f64568219c4f0

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