Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d75006078e38175…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 05:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7608a3ccf01cee984bf6d81e8f2773e SHA-1: 7d81449a4aff182dd61ace490a3f31a25c4ae0a9 SHA-256: 6d75006078e3817557ee0f79cfaf0c288083334b4eadac04fd7f2307d619e231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious or phishing content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://master.plus/wp-content/plugins/super-forms/uploads/php/files/51c9674a2e3ec05cf2f8338f136f6ee4/jowituzurufusewiloleso.pdf In PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/mchr48a9jcbfr9utopo3fdtvr5/66060669065.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jetujuwugusutigidajiwixus.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/2870392667.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/lepatixowesetidog.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/82744202945.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/70102438507.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/847070893.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/58814778905.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/kukibedevaf.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/ravilazajulagezenopodabat.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8738dac9---vikikizamifibo.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/guzuxevivivemat.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120786fddfdd---teditirowujavamoxepe.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/xexudomuxi.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/miguwevowexov.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hnsdcm1t2fh3psmm0ig077f9t0/wexilidofupoxub.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623192845.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tg93jdkiupka2bl559ujjga460/16676468517.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce74fbf7d8---pekuvuwukuxus.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/35132896645.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c364123b---wimadilegetugetezap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rules+of+football+soccer+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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 10704 bytes
SHA-256: 81241783862682d93d0d32da69198a243e538c19f81acad0844938bde11c59f7
font_01_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 17756 bytes
SHA-256: 76e634fd7816768f072dbfaf71c4f9ba6497778940400189cd0faced9b2dd0ac
font_02_sfnt_off000125d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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