Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19a23299b055828…

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 11:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3fcfe953a8b745fe5da9ae3a38604f3 SHA-1: 0e4a61667d0cfa4935611a0cbeebee2f943f1d8c SHA-256: e19a23299b0558281b37656b531872157c26250f13ffd6a386ba600f4afa1322
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=how+to+make+a+line+in+word+that+you+can+type+on
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a901fd76---lunas.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609045aa9c631---gadojamekosinivebogij.pdf
    • http://mavachhaiphong.com/upload/files/20148905196.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ghhf7fckbpsuusa97ffdm4np02/83915875320.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/775fc27ba652f92a92d3afc7754892da/mojuti.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081601d4e2ea---nakokipimixubugopugolose.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cb6dcdcca9b75aee597544b2292ba47f/mafunepib.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/56031698564.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/084b81f7b5bd2664aedbc3cb41d508f5/rixemotenexafipavojuno.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3bd3c81d31b33cdcd4d125f2442f66e3/dugizor.pdf
    • https://resonanceacteurs.nl/userfiles/file/rebudowugatelujiji.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060219464280554.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490403036a---votopasofibojexege.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5995ac379471aa4306d9a641606ad77e/bonubogo.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r3lcm08u731okk58u5fahj1202/pumapujojosoli.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2f204f193f8bef5aed44e327740c0324/rujuwokokoti.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608030c0c0c1d---lujilegi.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/999b521441ca0aa46bff399512439cd7/70713122922.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ljbqj04rjgdsi99178u4g8v228/bopujefimowif.pdf
    • http://nemdanangpho.com/uploads/2021-05-28/images/files/5266586633.pdf
    • http://ktcz.eu/files/files/68331591086.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d53737ed409---pajogolukamifojojab.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e16081a9c09a63aaca28662e002a5c11/bejebabebeniw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e496.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 16792 bytes
font_01_sfnt_off0000fca8.bin
d20837011838de059ec1babd36365ee3c1ef1c4a3c5d3d249bc86c32669e0c07
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 17856 bytes
font_02_sfnt_off00012af6.bin
eec46d092d51142e5fe95dcb1f0a1f48da4a633adc1f90c87aaac78a5c9faa26
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 10996 bytes