Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8033647b2e7fff…

MALICIOUS

PDF

84.4 KB Created: 2021-07-25 13:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6935abfa1898c941bc33a5322c376b7b SHA-1: 0a43603c3084ef6240e1956e0bbdf842af2cef13 SHA-256: 3e8033647b2e7fff28b33285911c5e72c401413822d2b52303f5b4b4665fef3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://buergerforum-tirol.at/file/tetijadilebazaxebetisizem.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083081cdee0f---52484020046.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f86a9e74c05---39495613348.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f83a8cd88---renux.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2974538442b288b59c133825eea15ad6/dajazemosokim.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/gojidenetal.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/18297779459.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1dc13ad108---17841602364.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051512261273499.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a945610ee3a---40456449329.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48fc2c1a46---dipegawudejav.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0fafa656f8f350b197e163f99faf3829/92266728663.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/ruxeberi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082792ff3972---99578686897.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3f8e13808e4008bd5129f25c2365d4c3/50956713737.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rcicld61g6qg1uj5ac0gemp1o5/javafajafuvo.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/10729155275.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-05/images/files/lotid.pdfIn PDF document text
    • http://17njl.com/userfiles/files/roletuzil.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/22054639685.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/fe266dcec1a031ba360111cc6ade7924/19683337031.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/99f16eb6c9bd6d2227a395440a1cc7eb/26302766269.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddfc7b56c9---ruwokejoxigerilob.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/madulufozilumisuxuje.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3e16c97913d4c7ea6319c52dafae57c6/mukivepipepozolevotos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+vice+city+apk+download+for+android+free+highly+compressedPDF 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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 16292 bytes
SHA-256: 36ee6c489f036c8296242a6e75e6c37a0665f17a1f0dae2b0cd23aa818c55a94
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 11464 bytes
SHA-256: 71b19e6c93b9465b151599aaef831daf0c16cacb3a4597fe4cad605a7ddd20d1