Malicious PDF — malware analysis report

Static analysis result for SHA-256 93704d3a1af0b0cd…

MALICIOUS

PDF

96.1 KB Created: 2021-06-30 21:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dda96c37a7a71730b031fe855b992e71 SHA-1: a5153dcff4b1808ed6d85eb8f1a7446bc9da5b3f SHA-256: 93704d3a1af0b0cd71d2ae8e239119030dada07ec05efc908612611108b1c3b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest it is designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1d0b2459---79123744213.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/26566518188.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3057c06409b3b275ba2eb9f77701655/xiwujijomovini.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee6b6b332---vudufoledoxizodesul.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ef1d455de7755db1dfea593dd92765cb/97485761229.pdfIn PDF document text
    • https://raljob.com/userfiles/file/72922144424.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098cbfd1ff19---83262422182.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/bubomokos.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4052fb38---lunukajakimemezawarabuja.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac876217aa---nugujokabexolarazugedas.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/38696868505.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160861b0ea3cc7---53282749585.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ee25e4850a7628b064ff31a26c2cde13/bevibebanaporoxanasipafap.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fudevusugoz.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/280924518184.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/korilewemorobojobuxanen.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b6d59141---sepowemikaji.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/60080dee390e122a2dc48fbdbcc23f6d/muxitunazufimokiduzi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec2471e85---topogosigejonovutoraba.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c417708d337---mirotafoxominawamuwizuw.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/28326367853.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7de12406a---jewimotegumurobi.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/36vosphotq8ai13eqhdeekhkg1/rixega.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e14065def220f2e39c666151965c7b3b/lawekawu.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/salitumasifitudifalum.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/51688722441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+the+word+imminentPDF 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_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4F 10668 bytes
SHA-256: ad87ca7ed2413406ac599b91fab21309443af43d4d5144516b5fb168e1929ec9
font_02_sfnt_off00014663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14663 17168 bytes
SHA-256: 1ac02dd59698d5d5abe2683a9f02dc560cdb7d68f3995dc1009e376b225b1504