Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f347838e298269…

MALICIOUS

PDF

97.9 KB Created: 2021-08-29 18:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b16660972434140d3dc87f76ebfbd14b SHA-1: bead26b731d616f24fb230197f86d83b37343fd1 SHA-256: f8f347838e2982698c43f7d8e892a30ce9b992555a41cc1375f16c1ae230881a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains a link farm pointing to compromised websites, suggesting it is used for phishing or to deliver further malware. The presence of external URIs and compromised CMS upload links strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://restravel.ru/ckfinder/userfiles/files/bifeveriladepexijipiga.pdf In PDF document text
    • http://morgancountyoh.com/userimages/16038261323.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/texazivuzaku.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917dfc826bd---14490610061.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/eecee7d31e92ecacdc35cf359950cace/xijonavabizegibupexamog.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/c202effc5a66688b5016692f144fdc2f/2971891117.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16239719728.pdfIn PDF document text
    • http://allycatering.com/userfiles/rejitiwiwu.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/37344343006.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7f12b7c441a0de5eebbab974f1c9345e/neviduzalukojumevaputu.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/dpagi0hc9km56jrqn50hea0hg1/sirazodez.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7c7c3ecef4f6cac1244b5fd4a9cd02f6/zuwolipekatelug.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/68rvqrf3dmr7slv3qd3g1g687j/lasidi.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/66415319524.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc2566067---70135202122.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/be9kjdtf4psjptd7s3gn16qndk/49414154459.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/legalrv99amds26urq397l7h4e/xadesixalonexafuzuxo.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210614_FCB679E5ACFFFD83.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/6706750871.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210523160228.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/d4qo42ngd41nqggal3uclrj0s2/padumebimevir.pdfIn PDF document text
    • http://riversedgefm.com/files/file/54320018773.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161201dff8b4af---vatufesumurarumi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609575c56cb05---wowozadofuwugatokejo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/10487758784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=causes+of+neonatal+encephalopathyPDF 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_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 17368 bytes
SHA-256: 74d98165f369b49abd99e0d8999c116cf95b893253d016e3622dfdac5d3501d9
font_01_sfnt_off00014838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001604f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604F 10632 bytes
SHA-256: d8530cdf7a1b8e1ed6e84aa0451c73ac3615e4900574b1377e99c616ed31ef5d