Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc833c3c2e97d02…

MALICIOUS

PDF

102.3 KB Created: 2021-08-10 01:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2343c4899e23bd3c020aedf03db00c7d SHA-1: 3e66e41aaab361978197bb7520a1152439191a7d SHA-256: edc833c3c2e97d029e797a8d2f7ee712a31411a0cff16c64fd7f7abcb3419e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://medvor.ru/uplcv?utm_term=ejemplo+de+narrador+extradiegetico+yahoo PDF link annotation
    • https://yellowstonewildlife.com/ropowamirijejet.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/1g9jh64ucol6h7mc9t6vhtdpls/89132186735.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/33e1ae496bc4754b5152d33ce6fca304/21494667744.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ec49373acc5789f0cb6cf09f7b81c38b/64904417203.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/gozanowovimumanope.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/vaxekusaxabilirexoso.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/naporod.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/40228870971.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/roruwajapuzitosebiwupenuw.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4222a75f76c263b5e204ac10b1a401a8/navisitakebuwa.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/4435815939.pdfIn PDF document text
    • https://songhong.info/userfiles/file/gotezedudimorewuvon.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e982772532d---7240302043.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/82711066878.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2ed57d28702418a93d69125c8f85ea38/bapemalajusegoliwa.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/wibus.pdfIn PDF document text
    • https://kham.vn/userfiles/file/39533939902.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9f48e565bb35198d137575e55cd87a60/dologisozavezutojiv.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/xukenezas.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1dd2d49a704e93a2917fb25ebd962e74/23990882436.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/41479626650.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0bad2eqbv2947t81vfou69hmp0/98413085783.pdfIn PDF document text
    • https://kede.org/userfiles/file/79991416020.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160720329a060b---lefadifazazunug.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160710e5388618---21993379434.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 17120 bytes
SHA-256: 4bdf365410e137848a72f73d2cf77a5e4ae772edc4267a4a44464b0474759a50
font_01_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 22108 bytes
SHA-256: 1f47beaec4616551343b3bd9313d5d52fe101761467dde4235c73fe5231df512
font_02_sfnt_off00014bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF5 2304 bytes
SHA-256: 4ada04022751ae08ed009703f743f92bf7c178c4ba10e25fa70b54da030bbd3c
font_03_sfnt_off00015616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2D 11124 bytes
SHA-256: 820c743dac9329b63fb0fd79eac49b086a5ae6bedc5abc4f0bcfd4cc3ab18d28

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