Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcaa61b5366e3c95…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 07:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8b9003ebc01d6411efe73479a1f789c SHA-1: 4f08bbc77a3354b7900bdf48c6014fbf3c8dc606 SHA-256: dcaa61b5366e3c95e6a3e3f102b8dd3f4e00ad6dc039f4b169b7a87a31e462ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of an embedded JavaScript stream and numerous links to compromised CMS upload storage and disposable hosting indicates a malicious intent. The sample likely uses the JavaScript to facilitate the download of additional malicious payloads or redirect users to phishing pages. The ClamAV detection and ML classifier further support its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://garglob.ru/uplcv?utm_term=watch+iron+man+2+online+free PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1330784a---41058566641.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312ea539ee0---ralidoburavus.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zofinasuvegikagalut.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/5416715863.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/87939805584.pdfIn PDF document text
    • https://0900107678.com/upload/file/87686017913.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/1874189375.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7f47d840---80360430555.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/xekadejetune.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/lerozekuniwax.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/34637243100.pdfIn PDF document text
    • http://sushi-belovo.ru/files/79713909658.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3429bb9196437c7a30d6c2cd7c10368b/15080582836.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/detexuvujefikegok.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/p7hu415bgo88e25hnj644efijd/94984805631.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/tuxunovakalar.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/42232602578.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/36960716697.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mqmh5287smo8ihriq5uuoltcu4/33269302826.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109111132106775.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9486fc0e80c2917de9175ea33231789a/muselizabun.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gp6d32h2721vdmp31q8i1u9rib/vejutitorikez.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e78cb7542f433467d89c21da48010285/mikekawefiji.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/bigajevenuj.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/12029317840.pdfIn PDF document text
    • 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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 14416 bytes
SHA-256: 104a0eaabc453a69b9872039f5fea3b58778f053721e9ecddbd1dcb36b3c3648
font_01_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 10548 bytes
SHA-256: 88e33a75fc4e96290f79d13b2bc3f39d754d88a3c0f18320aa70acc4202d610f