Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8827f6ccda7722…

MALICIOUS

PDF

94.8 KB Created: 2021-06-27 08:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6c5881bae2e98824c6657e298397b90 SHA-1: e1ee14ea9a5fba8694944742213a99c64475504f SHA-256: ec8827f6ccda772219d7b1b55c433013f1ac98bd37c608079139836c3e95bc4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect the user to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://industrialdevices.in/uploads/86621588093.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad307b64a---1908379191.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/60482551779.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f890e853---21063935880.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/vawesozazetugebopelopu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8d551d381cb4f276d051927fe1bae22a/29611414179.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/adc7836e0b23ec0feaa6235aa220c82f/76905500774.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/0745itdkf65dtegg0h1p10ekq6/90078082603.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/46f405091810905f40791ac9290d0e90/10244781628.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967333e44dc---femiridugikejigi.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210616_222819.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/pelopus.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79687623299.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/konapedov.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/99872687724.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/516f15786a3313663a20c6bebe886723/limajezafujemofupir.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/waxuvujuzodisen.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf5e665f0---99286383139.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609885497a302---75519552457.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/27948070562.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/jopefewazuzetenezob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=stimulus+check+for+social+securityPDF 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_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 17284 bytes
SHA-256: 52b1bf81d006e3b380507c918cc753aa5c0ea6ef8ca36abc4992aae726a84098
font_01_sfnt_off00013ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 10880 bytes
SHA-256: fd78789ccea120be28d82a1d19c4130ab94418e73ee1cba36b361b7d54649667
font_02_sfnt_off0001561f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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