Malicious PDF — malware analysis report

Static analysis result for SHA-256 4447a25f22a27b68…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 12:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a3815aba7911fba95d63fbdac20d298 SHA-1: de2c02441359e9c3e09d4447dabf3b87cd27fb71 SHA-256: 4447a25f22a27b68f7ec1e2b8ca8b82d9e9fab5ee1ecabf34609d2198381a711
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f1cb3c738b4161cc166eb5db46abb8e7/nevoriva.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/es7ae6ipsii9iv3kpgt1n77l55/namamarubigorajazo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///84914212542.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/96524974592.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e86a2fe1e0d37d9833d1a46076b973ab/gelepavom.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/zejadaneluram.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8e9e5f37eae43dd8c9e5c6aea5780b82/nexaj.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/28304732202.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/lomiropopikasipak.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097449820acd---kalujafedixafuxip.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/l9dooqeq7e2uqhsv0arfp4d1s0/54944008103.pdfIn PDF document text
    • http://topstec.com/d/files/22015869803.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cccbcc744c0---tuzikelabazasafizenowes.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/91947447728.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/em92k0fav7831ff68jg1n5tjci/62560603381.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/selasif.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5c17b708---zesuvukeke.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/17045720547.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/91262322274.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/38517327031.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/sidopu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9814edd7e---geviti.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/78216607024.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/eb5db8bf035ecbb8878bba6a4f3feca0/kefapazemikojonexu.pdfIn PDF document text
    • http://berbun.com/user_img/file/basesegineluze.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210826065700597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tono+pen+xl+manualPDF 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_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 17328 bytes
SHA-256: 405290b76b15b22740f0ab271c41f5ef9a0dbb8a77b8cce6a1b9b3b03fd90d11
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10120 bytes
SHA-256: 50fadb8c2e05ff90138659e6125608003a1a4408c7e90900cc210064171b615d
font_02_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1