Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1f7064f12c496c…

MALICIOUS

PDF

98.9 KB Created: 2021-08-19 23:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3a984cfc6e64701bcb22e05ef5e0f96 SHA-1: d1ba542808f12c6a1fce42dc92777427af44aea4 SHA-256: 7e1f7064f12c496c8f90ab243ddcbf60c61ff16e9f546df1a1c9e95ce7fefed6
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/selurexak.pdf In PDF document text
    • http://eichler-kammerer.de/xunuguzobupo.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/46861392172.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9003714776---6821222888.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/ee6d483f50b575d6cb377a9bd864b2b6/96265218269.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/93168014221.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/69437813100.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/56143910739.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/51715056024.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62ad1d30bd---jibupopuwu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4glr671m10dlc61pd7i968urkr/64351803736.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d1930766b0191ab0ff90d7007abea460/jizobegewuwoju.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///dewax.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xowugobupaxivimigigokoro.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b030931fbf9---46051249790.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/pixemexigevekonumotuxu.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/12053750013.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/katituwax.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69657493885.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cedb2aa1b69dd9993e3f004696dfb276/litadumexowa.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/042jbv5ol1pd9j1mjaq7lq9vk2/dulaxoke.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/6431926202.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060617435272.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210802045805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fnaf+jumpscare+simulator+android+downloadPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/7425a54a7263b07389237db7c5f80f5a/60001462801.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000f9e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9E0 20740 bytes
SHA-256: fb6bf94a97c259b00f123811c3d03902c4a260762b51341995c897f1ac60a213
font_00_sfnt_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 11076 bytes
SHA-256: 16c9262ae258e108c5dc70aa662f8890688a67f557ca3c0606b5f64791b5be78
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 3200 bytes
SHA-256: b4695dfed51f494d3e5aaaa92d883fea89281739b14d45a7e5a8c12ee1647a1d
font_03_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 28500 bytes
SHA-256: a8d2eee4dca3a23e1104ca3fee1494d7c677b2bc0bfab40cd91cf170dd31dbbd
font_04_sfnt_off00016329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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