Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6e709d526b883a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 16:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41740e1fc9fba91ff9bad1b9014e7033 SHA-1: ef16e2bf4820d9b679efdbc5f2ee46a9b201628f SHA-256: 8e6e709d526b883a931b78a8f5c7aca1f652d2f9a281630686335d8e09647def
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pacantioquia.org/aym_image/files/suvibimuwugodu.pdf In PDF document text
    • http://ehomeforeclosure.org/images/file/busawenozefibogowonafigip.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a85af260054---jogedakesakipodamipipetut.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/54532581816.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/rilapuseroguduxur.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/sejifuperapoxaxamopedivur.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/64749798579.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/naxalozamawexubilajuxi.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fdc1d4bd0b2ce21d5ef0d1da8238996c/lajut.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/bitigoxifuwetofizojuzajo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1879ccd51---natololep.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/rakimipawag.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5f3bea8767d55b896a3aa82dd11cac46/72605080767.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088d1d258b89---bigatusafuv.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bspd8o30g0cgrjc7hoqsri6cqq/pubivasubumaxorukigil.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/18873126924.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/juzaluratonamizigifawusu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072502543773499.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/83462658134.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/mmaue070agrj88tnkiupei8obt/nugibalul.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/63492368785.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/10841498870.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb38bd1222---fevinuwavogewabu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9d9ef8c6---35863596682.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f9a7b6b94---ridobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=maudsley+approach+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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 17472 bytes
SHA-256: 49d4d951b86a07d3160436de295a507475a28b62116b85425b512a0428e4f01d
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10632 bytes
SHA-256: 8f1bb55fd1a00e0ec26ce9b830d9c21839f7b5c5aeb237e72bdf629638479578
font_02_sfnt_off00012657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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