Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db1a04bb157efac…

MALICIOUS

PDF

72.8 KB Created: 2021-09-02 23:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 322ce82ef04b9de9ef44c3f57c3c7419 SHA-1: 9d11f384bce5639b93b1a6f8174248a8731e58a9 SHA-256: 1db1a04bb157efacf9c63ae3765cc4f69cce873cb39fe1463dc8d21e8f00ee62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4101aed670---dajovowonazibagavej.pdf In PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/66688126323.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/wakujelipotigos.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/xiteluxavexozopolenup.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5dbdac79b45190a89ac5cac39b3bec44/kupuxapolegaruri.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/86002576512.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/zuxuruwaza.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/udk3cm25r74nfm14405fq63mi2/rurogikibanotabowu.pdfIn PDF document text
    • http://edgecs.net/documents/36840812570.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4da93a701b---tuparaposoj.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/22179381565.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lexurepimidudut.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/42539367867.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/brh7badjbb4mjolpn13v8ubbrm/53142611079.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/st2lojnntjcd53buajieebduk4/nomiloxizopibokejizezawif.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/vatepukidelofapev.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210716003031206.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/kajesubub.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e63e83f3c0ea0204d60fc5311978ebfb/88511789798.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/829c4217c75e205d5799a0cc34fa5bcc/26672284118.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/15514962480.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lceu2q3afig4b32gil85i57jh2/kepoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=performance+task+worksheet+40b+answersPDF 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_off0000ba74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA74 15992 bytes
SHA-256: 9743b0d06cc23b12fd2e8f787084dec54271673ea990d6ac2f1020ed4382af15
font_01_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 10980 bytes
SHA-256: 4acb7aa2107568fc6bc0b4637c2f12a0f506bb17136af3703c6c578218500ddf

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