Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2b62a5dd8ce3d9…

MALICIOUS

PDF

116.0 KB Created: 2021-07-06 23:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc73d729d27b1e296dd3c07c41cbf24b SHA-1: 485d1819f926b5e84316898808571ce97e8db1b0 SHA-256: da2b62a5dd8ce3d918be1f66d3fa0b2dee961dc92d18318f415d3e1b3134c9de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f6e957e4f2---mogowezagakurutuvu.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ce1f37b374ddf98ef7fc303f1fe2ef70/zosarijo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f30bbf1c4---watepetegotexitusu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c919abea28de32c9b5cff5abcc600112/fexitidodorusunizolotekip.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/9829022022.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060113421776.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/97202025819.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lesage.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb655d01b---15485561977.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/797284af9405e0cdb035c53e224f6d57/sawatuwamisapolupa.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jafadatimimuwemexuzadom.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/91c7d3ae95b8a8a5231eddbe72d65fd0/tuxujanivafowedeza.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a50a563eeca913e38cd35cbd4cc852cf/juwonuwudubamepunifemeze.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086a829ab75f---popalisosojuvamevi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zagezudelelonexen.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/52a372d6d82bed94b2a9cb4c55779498/99535577585.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/45072052487.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/12409558545.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/94964170858.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a780441020f---bumavaravitemebux.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/65862943638.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-20/20210620221811705353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=as+discussed+commaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 26592 bytes
SHA-256: 33594556ae4b2135b4444ba1b3a36ae15d3bef79c34e259a9d516db5d9597412
font_01_sfnt_off00016e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E85 3440 bytes
SHA-256: 066f6ec281efefa398d029427653ab9f2d91c195c1a0206253db02d7c07a3588
font_02_sfnt_off00017c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19450 10264 bytes
SHA-256: f4f90cd23a149642edc3eb478a503acf52623c6c7cb3153b39242ca43c1bacf6
font_04_sfnt_off0001ab6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB6F 16388 bytes
SHA-256: e5922ded999cbdb59a872b8eacbb4d8ac29bd89783fe0b79ee6c2b11009518ad

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