Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc917435b527943…

MALICIOUS

PDF

90.9 KB Created: 2021-09-01 00:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 981027bd24f1dec1df9aaceb180b8f28 SHA-1: 94e1cb2428427a883f0213e9d184d257d9459a36 SHA-256: 9dc917435b52794346e59824f5fba9f8009f0934e4626355699edba43e9e18fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the link farm structure suggests the PDF's purpose is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bearings-home.com/userfiles/file/25194336267.pdf In PDF document text
    • http://land89.com/ckupload/files/12150607117.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/lurawukanuwib.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e925a291791---sogubagabelarepejire.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a078bf9b1a8651ccaad01cbf0c826b2a/vogekewalaw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e6db843f97903535cb908c7f9d4770f3/gutogavikojot.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/tuwofalilevipe.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/30/28640302840.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5koulqvgcm1658o92lkdb4au94/87138027765.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850644769b7---lixixiwid.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/vurumenatobodidotigixev.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/65675281439.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/junobesuzopofopukidaza.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/85109881006.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/18443143360.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096756dc370a---botabututeru.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832dba02c26---12997418282.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/79175105431.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/8ac59b940bac348c1d0b12ff6b7fc160/31846699613.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/63371388148.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/xoninutomofisumigubimokig.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/45550220746.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051806582397.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210702213641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=4+month+old+puppy+barks+at+strangersPDF 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_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 11176 bytes
SHA-256: 7894bc113332402896f255ea0c722578b7133a1968865673d470f6c959d18230
font_01_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 18268 bytes
SHA-256: 46493f48dad9a8b4344a331b42444def95a3644fefea711e24ac8d5211f8ada4
font_02_sfnt_off00014470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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