Malicious PDF — malware analysis report

Static analysis result for SHA-256 0456c4dc00337ab9…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 23:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 239acc0e5d26b2b48b3eef4a29b4eb29 SHA-1: 05cd7edc3743900437a57c4728273663298bac2b SHA-256: 0456c4dc00337ab98af79baf73bca55d93582fa2bf8302b6ce7c9a025b3c989f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to disposable hosting and compromised CMS upload directories. These links likely serve to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac108ef17aa---68703963608.pdf In PDF document text
    • https://bocion.com/ckfinder/userfiles/files/moxurekebogoxukokoba.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/fenadil.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zotojesovozosikozejosoti.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vrl4rdu7joqguoafca46qd64i3/xabuzolerura.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/tabujonimobikawidosufefe.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3ca8173fd6a23ffdc8dd4d44970520a3/72594475791.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/74fce3d6a3234269a42c31b1f32a4842/wimekubin.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/30/48643771764.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fffa18a3f9---30239087446.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/ninewi.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/mezas.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/burigenigadegumanulebuwap.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/gaxelelemutaxozexil.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/kofibuwekopimofe.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/supuke.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2184f313---bulewokejon.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/65327945870.pdfIn PDF document text
    • https://actor-conseil.com/files/file/julaseredipetawuzofexeniz.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/186218a20337b57f5946245888ec9a0b/rirumiwet.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc05badfec---90654884553.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/tepafavovi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6843296c9---katafuwatikididitolefa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97fc7905b---gifezujedezop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=historia+universal+de+la+infamia+jorge+luis+borges+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_off0000ba8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8A 17672 bytes
SHA-256: 0763bc515c012d5cf3c9d6a45f4e46c5ed7ad088620ab167516e489474e1eda0
font_01_sfnt_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 11268 bytes
SHA-256: 06270fb5758636180cf57fab95cf947c628380b0caa7d218b88755e8d24b8569
font_02_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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