Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da70c4cce617058…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 04:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b472ec97f00fbe15f30a3ae0ebed478b SHA-1: 42ee61b9a008fbf364f60fa52b92842536ba136a SHA-256: 6da70c4cce617058778d7e6b5395a92c535b5d434cb3f7a60c5981ec7035a0da
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or serves as a phishing lure. The document contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple external links and the nature of the hosting (compromised CMS) strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://rebeccafantarchitetto.it/userfiles/files/25936556038.pdf In PDF document text
    • http://muszempilla.com/files/file/rulefebawalubapifikel.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cc1b038d5a9cceaa727d5cf1d6218ddc/tikokaro.pdfIn PDF document text
    • http://skisun.it/userfiles/files/14127981607.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/92536360915.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633e54bfdd---xokej.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdda421c13---25488299159.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/20ae53ece6202f9d6c5bfe936a79a1a1/98853588139.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/jivupis.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/zogoropor.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/35766671713.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/getedonijenebuze.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161259874ae8ba---lofonatosofibowepuw.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/nagiwov.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/mudikigupur.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e3104ac7696c7e254e54d31cfc50525b/tobem.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/46522573015.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c1f0ad86f793ccb260a86254280ae9b0/zerisurupupa.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa8b68d72---zotuxixurokukojesin.pdfIn PDF document text
    • https://aokman-drive.com/d/files/79785813416.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/35826709490.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/dodimokorotakoweloxexapax.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7185b5227---folorekezidufugag.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/nj8194qoserukor3npm1cuoap2/19613704577.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/18054173704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=naming+compounds+practice+worksheet+answer+keyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/134033ab36682227e7e39447d6c25a6a/wotixuzelafekutivivisefis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 11284 bytes
SHA-256: 1232d57a8e4ef41cded9525a61379a59d51c2c8e0aaafd006edce0f0a58650a9
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 17944 bytes
SHA-256: f90ca4d6cab71dff7293f487f15af87f8bf00fcbd658ef0c914de203914d2139
font_02_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1