Malicious PDF — malware analysis report

Static analysis result for SHA-256 4064bbc4ffbad2af…

MALICIOUS

PDF

86.9 KB Created: 2021-07-22 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76fefed045d90942a4eabeb3c5e3e640 SHA-1: b1452b1b36e70f3513a5cd183f2abfd88e0abefd SHA-256: 4064bbc4ffbad2afdf228254c7303fe3e825acfc836ee0f55dee8757bbb4164e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to external resources, many of which are hosted on compromised websites or disposable domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://dobraukraina.org/sites/all/sites/dobraukraina.org/files/mepasonusaditemo.pdf In PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ea97df5b5f2b141573b36a569d006313/vuvijagaxabokatij.pdfIn PDF document text
    • http://liyangah.com/Upload/file/13140507869.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/gemagasironow.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/210877ec05a240135a2c8766767427ec/95800780985.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe523a16a---14577543522.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/20342787605.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xukalisaxijifofapivat.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/89291294573.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/98382631777.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/50f57bc2d355ee8bf832b68a3674114f/xujov.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0321e369---52405498624.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086d18356d6a---57852537986.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3m77061fa98r3l13r00cjke9ql/10806562975.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7aeb01aad---4006252360.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/dukaboxesafiwe.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lagujufesafux.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/denote.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nixerinuxufukuvodog.pdfIn PDF document text
    • http://tano-cable.com/d/files/definikod.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gomexabal.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e41b6177e1b8fa5c396b263d136a0795/71730050861.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1500c1bdbcd94121310074659a01c1e/71565864467.pdfIn PDF document text
    • https://activepymes.com/pub/file/82997018408.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/8404017709.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/15657589852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=charity+shop+furniture+collectionPDF 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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 10824 bytes
SHA-256: 94b5f6829ad77f021ab4ef5cbc53aa8581f2dfe4cadee272e33d796cc034dc5f
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16744 bytes
SHA-256: a57df36be33d9051c5d8e947903a38ce5b10aa29c7e1125d54197ce797e213ae

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