Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c55dfddcea4404…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 17:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a6396a50b0e1e387d3068133a9a9ac2b SHA-1: 95eaa065fd68582d34d91415ab5d3b21d76d1cde SHA-256: a8c55dfddcea440454ae680428139136f054349aa0251ae7a648cef1f68e87cc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites, including one hosted on a compromised WordPress upload directory. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/5293484de99df784f9aa174a5593c879/rofun.pdf In PDF document text
    • http://varanini.pl/userfiles/file/menijodedu.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/66051887757.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212d68e21---lerojejozoxupex.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/389249214bd4595d77aa8a643666b164/puwulamojaduvukevajif.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e974c692e399bd0e8aaf122ec9664372/fufoponopirexuvowuruwug.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/86717081144.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/mapevet.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d88a07e43ec56e9f143d500001759b8/xudusudimawiporigit.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/o79873d7keoo141knsamqvbvn3/xapupan.pdfIn PDF document text
    • https://parc-hotel.info/file/84447002258.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/ruranigijo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2e0a97d9c---zolorazozafuni.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dekimiwu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160967cb97a078---8160001857.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a97c30996---71009559431.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/19464685015.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/50154963688.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/joxekefaturedubiledaxawid.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/fobigodufozux.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/temanopozavureterusesik.pdfIn PDF document text
    • http://coumert.com/images/file/gazuzaki.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4505911db---14258468679.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/7893436184.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/0bb4abbf7d14512b16aa67328cc9bbee/fafudegukerugizoluwopareg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=self+introduction+for+experienced+software+engineerPDF 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_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 11160 bytes
SHA-256: 87fe23535539144780d875c1143f96a530a7e4c621f266ab89bbb4a2be49cb49
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 18044 bytes
SHA-256: 4821bd590682b6e15e10ed954c0fe11328e2cacab934f8ff139c809e91205a94

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