Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a83b73d8b9c8e67…

MALICIOUS

PDF

72.3 KB Created: 2021-07-03 04:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 461900f8e233e0b3bada53b6ce23f2ae SHA-1: 6b3fb9679eac17afee233e49fbed3c0dd5bb38d8 SHA-256: 3a83b73d8b9c8e67a5052c4c38884aafab8ac4c0b0434d0de4b298e579eeb9c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The primary attack pattern involves luring users to external sites via malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://advantagelic.com/singhania/downloads/file/lezafiterezijage.pdf In PDF document text
    • http://lawina-radom.pl/files/file/mirujinopopagijimozuneje.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/1aa1343638ec997f20413e5c61d9d826/1556506974.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba255f1501b---10185905768.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/49hl27nuueb3eg6icrnd9fm6rs/pamofavokoferiberog.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/97a31934f04af1d8f5c4b14a830936e0/fabut.pdfIn PDF document text
    • https://castel.ro/userfiles/file/68449894456.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oqh879i96b1ts05g9sf7of0a08/950948293.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/679627021.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c282e560ef9---pesenelazukegadodano.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1132519320609d4eb446cf1.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/c57qdisd69p8r36q1lgubgkt2s/xutaziwaguvemowiwejapo.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7f784e264c9a2fe5c61d28e92544e3e1/94119957496.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f9728434---tigowoma.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/xudujotinilifetaraku.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e898c8d293b8ef7a4d1be3a6ee84127f/70077725028.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608004fabe6c3---bilofowasufobojixulazubup.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/61286453977.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/22512780981.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a942cab7fd---zumolarejorun.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/78217758237.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4dc2e585---74958042059.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/vajuniguruwadaxepu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3c7553d9---kowilurulizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=verb+exercises+for+class+2PDF 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_off0000bc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC49 10456 bytes
SHA-256: 608aaa390f0df3951d3b0748eb653ba964e0b90bf4d2bde7e7f2aefb5f033ddf
font_01_sfnt_off0000d437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 15088 bytes
SHA-256: 99d311dd74be2fad7d7edffb5502a5330322c2231573aef9ba5a1a8331e68a30
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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