Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fe5a0b043c6534…

MALICIOUS

PDF

73.2 KB Created: 2021-06-30 08:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9793b7fa0e5dcf1c29535dc2d59ab7f8 SHA-1: 1263df36c549d7eefbf8fff5410b0720321e51dc SHA-256: d4fe5a0b043c6534bff7bee6dbb4a9f97e3a4e959cf3d788506dc9af72198d67
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ambvet-trefontane.eu/userfiles/files/51639625361.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/982c9ca346c507e0e1c35d5666e84046/mupikafonanufapasikij.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/db0f728cb6cf354a7b7c57e523ec650a/37065126034.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/33437034790.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/99450411960.pdfIn PDF document text
    • http://unsersohn.ch/images/file/buwitoxukefeno.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1386c9778b2c2da319cfa906042276f6/zutogu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/xoliboxerapebefanuvota.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/62371272103.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/71690967406.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/21272263321.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/239d909cd3f0fd788c4c2c06cf1f785c/luzibilavudigivepiw.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/birupetokabid.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/85850152156.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19040bf7c---toxikofoni.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4092c8bbb10dd39749b4e32cc220ce6/84281851422.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/760eced2d5905a81291a51b0c170271f/getibuxeburef.pdfIn PDF document text
    • http://k1a.ru/images/files/file/tegopomabefipamerosijeka.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/74240156917.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/44b11ba3255b828b7554143c89eb38fe/88198144124.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/rinadubumesafogesubis.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e41ba0210---33485017133.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052417501875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=beijing+chinese+food+near+mePDF 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_off0000bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 16524 bytes
SHA-256: 026fd453e40d34bca3c8b98faca7db1437989fac3e785e8a95eb012a2214e787
font_02_sfnt_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 10960 bytes
SHA-256: bd3d1ccb6d47927472908c2cbaed126d5d76ee0fbf1c96ee8838ee011b2263aa

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