Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d0e595ffa73890…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 06:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4dd2bcf99808be402fa7a9f8e860229 SHA-1: 735077f69f91279fd2ed79aebd361198e90377ad SHA-256: f6d0e595ffa738905edc77d1448e3b56dd53da20e127467bd52d64d6e02597df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure is indicative of a phishing or redirection campaign, aiming to lure users to malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a4751b4ba15fe0d7b5a5c3561d4f0345/28744132382.pdf In PDF document text
    • https://chmelo.hu/sites/default/files/file/posozokasufobovi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16092362c08d3e---vigibejaxakon.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/82003289556.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/405a85b0cb1c051db48ac265ccf38ba4/72056269145.pdfIn PDF document text
    • http://groupkaishan.com/d/files/nigonunifomosu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/nulezuvozakod.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/064fb9f70380b46827220b3785b213f0/45899105953.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2db8c6e0c7---95847602622.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jusaj.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a9acb053---28240201737.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/malidas.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/29758253967.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/4220695112.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/55krjjdlct5ap43h2n8kvk9sjq/99732212620.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/54212742317.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/79524693592.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/c3928248f64d2c3b5ffe7909229f3017/57165327550.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/44394369665.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/xevurovolezuwikago.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/kapojiwibututojinepip.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ae83c6c0ebda7cc5e7292cb649c56581/nozosavurodezukojax.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/gelubezeruxanogoluge.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/4650286884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=verbal+ability+aptitude+questions+and+answers+pdfPDF 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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 18256 bytes
SHA-256: 03078463780bb0506e19e3b66ccf86d3c620259a34292c44413aa76ce82c5558
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 11048 bytes
SHA-256: 944fea1cc5ddc4a677cb0e854a279adb149b27f3b3b16b7d8b7baf5163057da6

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