Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8dfda8e78c5607…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 03:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 494b2606b05e4eb05f33c13b491489cc SHA-1: 86899d492ee3c22c1509a33baeabdf0c56ead165 SHA-256: ff8dfda8e78c56077b9b77a2a22f73f9e0b1bc97fde302f2ef42ce3b076fbb28
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous compromised websites, some of which host other PDF files. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7886

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=cloze+test+questions+and+answers+for+bank+exams PDF link annotation
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/86725834171.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac584b4e51c---zasadujaxasebi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/dubemodo.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/61281553780.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0608241bde17ca9823cf0c5b43ae489b/52639070042.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/94556818411.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/94859906785.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/lafutir.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/manabiputodazobop.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/49c13cbd9314c3906318a16acf86479c/15798916718.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/nozitepadamepekine.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d567e256e---xowusemadekuron.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/14655300144.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb73529eaa---30250093878.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/85506388489.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088779106323---rimejumani.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/20a0e154c5a8d977046640556b24b1d4/40434056116.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160717195b0da1---24109748001.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/6223535619.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/36685352316.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/dafoban.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/92020669903.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/wajuzudasoguxa.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/rigolajaxiwe.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf06e1ce8---gugozawisarulajap.pdfIn 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_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 17768 bytes
SHA-256: dec5eed7864c9935f3023f5fda00e098a7a2945c4fddf4c54fb3711d2d5ef2e6
font_02_sfnt_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 11272 bytes
SHA-256: 9d2bff72c5fbee9e697a4a610dd648482ab8114cf1cd4dbb66adb1e229441852

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