Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f38868dbb76c4c…

MALICIOUS

PDF

90.8 KB Created: 2021-08-21 17:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72186c6cd1fb074a66aeebbfe76f8255 SHA-1: 1eaaa32a4a0378f8bf66c9643ac13ed9f87db367 SHA-256: 95f38868dbb76c4cefb59dc1f0c5997bdd682abf6f9415f19256fdba96b7bc1a
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 upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0974ff95039c98b1348480294c06d458/39121118324.pdf In PDF document text
    • http://lechioutdoor.com/userfiles/file/lipalatinejoj.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/zimobotosurofasibe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ruxadirimilojisoluferiver.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/molodupoxewubopuxasob.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa4d4bc76---ravexuwege.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc0f232e8---baramegorasafezibagonu.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/55541060139.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ace2cc3b9a0eb6d9692edcf2fe35e96c/favaxon.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cb3c62525---rozolikuzikoputokoxu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/fabuwuzogoto.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/24c9a178da84f7f654f2edb95094bbbd/worewinijiwolemo.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/27510246773.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b7b9dd30---10589384342.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/kazipivutepuwitipebiwej.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/16721602825.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/95460163316.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/bojasitarodakotaxedefaza.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/xutofozisomotekemomufurow.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160717105d75b9---93664342575.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/rnh747500cpnedibgj71tcfcbv/kasobalixeluzuku.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/ximataxudulezemub.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd06e4086a---widijopulorejewev.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/zogidoxetopapagapu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a8c77f622---serikabixobofubokip.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29ebe5cad---jujalazefor.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/vixegexipogesumozip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=circumference+of+a+circle+worksheet+7th+gradePDF 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_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 18844 bytes
SHA-256: 590be06babe55adf11997676f06231f1ce0caac7f7922eb6ec82f55ef89a0bd7
font_01_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 11284 bytes
SHA-256: 458d5b681098f4d387c1365837d8ad8285c8ca5efc41ae1ea683baec6f86af7b
font_02_sfnt_off000142c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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