Malicious PDF — malware analysis report

Static analysis result for SHA-256 75109fb24c445dd4…

MALICIOUS

PDF

80.4 KB Created: 2021-07-30 16:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60f269c82ba6e6808455448afc4036f6 SHA-1: c21c7acc7509b4048c0fb65683845d8557dcf0c1 SHA-256: 75109fb24c445dd452682baf010b683014948e0e53b177d9b0d3eb1461577425
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or redirect users. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attack pattern involving spearphishing attachments designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160893f1096af6---jadufijurogokeduzusafis.pdf In PDF document text
    • http://ddgasul.com/userfiles/file/8348128255.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a4341a08430f9be2ee81640cf34de176/21172091910.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/difenumisitakagiziluwi.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/81458659003.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/sifefixudimibeparam.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/79247748990.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7494d93f59---26433284169.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e838af76a36---65643456200.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080d20743cf1---20262967180.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8134d37bb1a0cb2c5b3e1790abcc6042/vejajudopexu.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/21378591828.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zajirufizujox.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/6691235522.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/85010625335.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89c5da620---76801506987.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ea935b0905713e0fbc7014715540638c/novumozavemumakiwezuki.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/tmpcq5viot62mto9n643at33f1/fopexijumalujuloxafugez.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716106a01d1---11548185808.pdfIn PDF document text
    • https://lasanisports.com/files/vudilexek.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zifagopog.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/lelibinaxexarelok.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/29803387531.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d4227c08a46aa1ee0cd2ccb2ac784fe5/fodolewudemubi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/be35512b31eb804c67d23f3ebbfa7187/77671778080.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/devonibofumutedegolebiviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+legend+of+bhagat+singh+full+movie+download+480p+openloadPDF 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_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 11608 bytes
SHA-256: 664dd2d8847b0424cf2d5b01407205d0f12cc63b89e3fd36b97e01b20dd00957
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 16976 bytes
SHA-256: 83a77d0a64c01f0c3a7cbf6060a4c276a0de313a9ed7ef9d9e8df57aab257699

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