Malicious PDF — malware analysis report

Static analysis result for SHA-256 2512c84ebc98a2c1…

MALICIOUS

PDF

98.0 KB Created: 2021-07-28 03:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d7fd50636f4008057b4b63e24185db6 SHA-1: c65f13565551ed3c9c498189b45498c8037d6228 SHA-256: 2512c84ebc98a2c1cde91c3c71ac3d09712c85633ca237486af0cfb1f31fdb03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of embedded URLs, despite some being marked benign, suggests an attempt to redirect users to malicious content.

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://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5cb1176fa---neledosijobasep.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32be0169a3---fijijarexeduxerowiv.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6km0linggsmpsmg3duebemcas1/nomaxojow.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/mubijupusezinilowop.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b1759de8ca284c95edbcaaaa79fae452/17744701325.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da03148826e---kesolubuzopigaw.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duzapibawazosagofedup.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160789c0f72621---xulasuvevazujuzewezal.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c39095b21bc---28386002814.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/mujumiwituxoxo.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/56975437114.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/6bgfbokhn3c4v63sdav9prgt5p/83850041573.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/08cd74b16fc27ec09d50a6d530c9d956/66418517579.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c36b070b---masitoziw.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/muredejoxeruzugosis.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/vegezasemevukewag.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/mejirabewitabezukuvavuwog.pdfIn PDF document text
    • https://dineflon.com//files/falevimif.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/afd9ac09a608b9d03d183f47a5e9aada/17159272625.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/147c0be8740928823092d553a84d2e0c/61128788806.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bceadfb6e7e49bb8f444cf896a24eaae/wisekesil.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a349f578fc3---74956530735.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa950c49a---32445784286.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bf76667c0---1484539882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+thermal+fuse+on+maytag+bravos+dryerPDF 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_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 11328 bytes
SHA-256: b1e8266002eaffedd3219676f057e74f3a9725c009e4c9cf50909658c6af3888
font_01_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 17176 bytes
SHA-256: f35a867e76dd229dc157b2bb30d87ba5cfb1a698a8ec1f028c667d8c04960739
font_02_sfnt_off00015f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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