Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f27eb6ca51e8e71…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 07:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a0dffbebb6b4e76ae88e30c37ae0741 SHA-1: 7bfbef51a7b1797064f5f61dfac35c7271977689 SHA-256: 6f27eb6ca51e8e712dee8ec75dc05c3d86f3f352414c3af2add23ef54b9db27b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The file's structure suggests it's designed to act as a link farm, potentially leading users to phishing sites or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e66b2818d49---xalaxupoxakudumizeda.pdf In PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbab540357---19878140334.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/8828565930.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/43919048581.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/fusobukugusigatufovuxisaj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0g7hddg9t2v8evpeisi3j9opj6/tuponezuza.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8e127e670---80268194489.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/61915875412.pdfIn PDF document text
    • https://blogsma.com/files/77906897030.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327adae5fd---pipewofuwumitesorijo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a31572cb55aed6f789bc43425e361a73/piresufiwunaduwodi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d453200a40---14794545889.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/14704655545.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/77760918551.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/83022632509.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nisexadabubawek.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4910732ab5---vaxorupeneratilebunagim.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/90976735461.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/fuvejijon.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089022c3d93b---7571558165.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/pijakakubigojaduzi.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a2eef2ecb---26319987166.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/sakepurobiriwavakotanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ket+exam+sample+papers+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_off0000c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 17240 bytes
SHA-256: b7b7b7e8ca8415a0be1c6e594f8173b16f8a632efe300951a2c5282eb2790c46
font_02_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10436 bytes
SHA-256: c4856ff30b05eb3e8f6ba4a432c2520b6de62e257c9334813bcb51d56f0820bc

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