Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ecba21e4503d8b…

MALICIOUS

PDF

126.8 KB Created: 2021-06-27 17:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ba43e0a08deee73e43dc03d25f3b38b5 SHA-1: c920f9dc17a0fb9d6f5ef6610b5053df2681bd3c SHA-256: 61ecba21e4503d8bc2761d8242caf20fd9d4fba7b2f58c8cd96201ef92f80413
156 Risk Score

Malware Insights

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

The sample is a PDF document containing numerous links to compromised WordPress sites. Heuristics indicate these are link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to the PDF.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608495f44ab02---68615563227.pdf In PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bd1aa01a9b07a69b98a0cce010b7c9bc/4696082980.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/97713561100.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6df7ab34c22742e2f54c410b9a92917/samudiloxomu.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/l2rn66efab567ke3vp3b6o1540/pajugugoza.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cbfc34d8e7f0463c5f02923c64514ee7/51822517325.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gefude.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/94hkicdccf2712n2c6ct38onv1/xopamaj.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/foren.pdfIn PDF document text
    • http://cy2hand.com/userfiles/sadowumedazexejenufuzix.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/dddbed604797fcfd6a355dcbe05d0a77/56957472653.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab9daa7e3---gubuw.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c289b21227f---90368354112.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160792744c4756---46794261731.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/e811d6989df28471dc21f972c46c547d/bimagenevafakinidame.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3b5cea7538fb15e1990fa8f9c1165d77/66809545824.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/jazajaw.pdfIn PDF document text
    • http://cy2hand.com/userfiles/19707892769.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/rotufusepaponazesomosurel.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076238187768---pemidipijilazugozete.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/12414176693.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/srctng0nld9e4f21bq7j69r0r9/jekuvamajapoboxifizuruv.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/robuzodunisufozodeligu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/20291509646.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa8d35e04---23197071932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lacan+mirror+stage+pdfPDF 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_off0001896c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1896C 19868 bytes
SHA-256: 180e8978ae05b51deff95e4d232f7d82efd069d39c9887c606a3ea4c16aa5b61
font_01_sfnt_off0001bc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D495 10872 bytes
SHA-256: 91df066c72782af1f2f8df0e96340a4f95673ace5fd7c4d10c551254112f154e