Malicious PDF — malware analysis report

Static analysis result for SHA-256 8633897bc773d69e…

MALICIOUS

PDF

92.7 KB Created: 2021-07-21 03:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2486ce26ac1e147ad2a9f6b6deb29b7a SHA-1: a1afb2611b89c7afed5a761dafd5b405e517fcec SHA-256: 8633897bc773d69e8d23b2fc32ae4698e138c448595b8fed4f5ec2dc2aeb2fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links, many of which point to compromised websites and disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL analysis point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://study-abroad-travel.com/ckfinder/userfiles/file/94586797674.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcd4a650d0---54877185439.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb69ea9da---mefofefanisa.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/48931641101.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/5535704056.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/mr7lt1u0vrla9p0j8mk8ci94hv/daxekenibovowi.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/rikebugomuvepibanul.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/58448755283.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/sejoxikolodagixone.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44398f090a---71830683182.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160df6317abf8a---84371836723.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a13df2dde---60644285032.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/sexaxawikuxus.pdfIn PDF document text
    • https://fototipia.hu/files/files/70273981680.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/4b92feb10c96b0b01671039748bf47da/lizagugalapogibezesuse.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/muridanokavirar.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d70286678---lapavon.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/nofetanap.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/33a5f514f766f18338251f582a807d8d/88929039256.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/4076249402.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9471a8b14---11264801181.pdfIn PDF document text
    • http://sushi-belovo.ru/files/26886229766.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/037713ba35a59480aa378ff70bc66d25/megewe.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/aek4jf7kqdb9vhvcb7hklgril7/31384359367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=networking+viva+questions+and+answersPDF 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_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 16560 bytes
SHA-256: 52a06f5d50e709ec968743a0ac14d73ef6132245b8358784038350e673b734a5
font_01_sfnt_off00013465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 10844 bytes
SHA-256: adaf9abe320d1540c25d47f3e4bc031d69a7fb23b064f18a72f176248f542c86
font_02_sfnt_off00014d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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