Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc5d773ddb82b0f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-16 14:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfd117499a38f8a0dddfc6127716f8a6 SHA-1: 55b11e50703da63352451181c0bc0c7d2779e0b1 SHA-256: 3dc5d773ddb82b0fd3c357913b8413af8be06d9811cd1d45cb0036b7a5fbb6a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://annassteen.com/ckfinder/userfiles/files/34558867646.pdf In PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608748b82c977---18994348877.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f19d872910fd00c494773bb92b33a6bc/24993547246.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160767af758683---walewosebaxaba.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b086d0e3754---nuwexipotibavapitimip.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/nojiwewitegutov.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095a76dc0980---poporamuxobomexap.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/tivaxopigaxogararokiga.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/dfa687b3de7892a57cfb438fbebd6bb6/26720997518.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b41a3bc8---96817008399.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/c7j0r27d4ric5042hol9b2l267/83827748893.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7c1a03d7c8b4586f21765ac010b686bb/5097323235.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0f2142f1---pegirexuripetipep.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a48c27fcc05f168f4d6e87db8a889d97/26716368101.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/891772837337c57812f3bb45d48dffac/wobawuxawibogebek.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b570d8e9b0e---fizuvigenalerukaroxe.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/76922339952.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0892962001620745673.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b896cb651df---95959839404.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/sidisopef.pdfIn PDF document text
    • http://safarang.com/basefile/files/wudom.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5155be7f086c6634e62deb1c790b63e7/80362862237.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ankt5s7c55djar27j0k6bflod5/deligelumivipepisokanitu.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/lijafubejuwizifevivil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=save+multiple+webpages+as+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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16620 bytes
SHA-256: 609b1b71f273b969859dec2cbd1fc0f6f267765c5745d3c25010185ae9797eec
font_01_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 10984 bytes
SHA-256: 4c6f3f558090abfb5221619e8170a0989c5a64298927f1daefdae3803cca81ff
font_02_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1