Malicious PDF — malware analysis report

Static analysis result for SHA-256 b636f892a0c2ccf4…

MALICIOUS

PDF

86.6 KB Created: 2021-07-21 01:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9478000aacf7bb5575c3d59b529a299c SHA-1: 9b54c8e016ccffb152f09442a1d2f64f995c42f4 SHA-256: b636f892a0c2ccf4319861418f49b861a75b385b00f469cc320342156ea043df
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the presence of numerous links on potentially compromised domains strongly indicates a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0124b299e7---texivigogen.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/29b3a49645f3dce433a9b9d7fbee18fd/38844313371.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wunokalivezuvogowusuk.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tutuwelisariwurib.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/tatixawiwof.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/oc0er6cft1ah9ehf2nbtgg5r76/zirezozijik.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/9748827606.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xifetudomabasuz.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e6b27336310c90d2766ff6311c22a8d4/ziwuzifadozefosal.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/52puokddr61rh4a3ivg3ov6qm3/40116499938.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/refame.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/mafujakexasekisikeko.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f085ed0bdc---puzezavavefe.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/jevoxazekosovo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63b4a7f85---fesibapaxafenogedaweveka.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6927163a9e25ebf7d48f52d658eab80d/30752119548.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb57a0156b---fipibikuvedibupulota.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/57191735119.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4k38pnto869om0diuprp6j6n3t/93556560342.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/kakomu.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/gavarexomaritarabaragigag.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/14750447752.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c659af29868c9ab890cabefa30989cef/6913202832.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/cjip6iss9euahnt5p1hm9qegbg/kezirizukasikiwo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609899fb2ae3e---32636602319.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/gofonoxebew.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/55602810473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=exceeded+meaning+in+englishPDF 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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 10584 bytes
SHA-256: 4c419bd74e7bfe640b72268dedd849486526645476cb25db15599518ae4cee9a
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 19436 bytes
SHA-256: e892f06217c06baa95467e24c3890e009d9d1c7d61e70694a5cf1268b44a7e65
font_02_sfnt_off0001330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1