Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de2e6f56b315a31…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 23:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b81d5447ae707329ade8db2632fdad9c SHA-1: 582253206afd4925e741bdb4ccdbb45a3cfe5e94 SHA-256: 1de2e6f56b315a3156edb35adea67fd49424723d32019f1ff4996b666665daa2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f8d88697---70663925619.pdf In PDF document text
    • http://debsecond.net/UserFiles/File/84953646821.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160904b67198f9---teketarubetuwovope.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b319d695---nugigidirimorerizuvaba.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9c432c5e28cf7b8298abea1bec8004f0/93591321874.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2sdtdj0jhjectkkavpm28ehp15/74985885720.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/sipozetunezafumi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0t7pt0f2mov1afp00veo0k0ran/tidelovireverakowobedike.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/29837467525.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ff7c4c56a---pegokivudenujo.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/wiwap.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8116b21d8d1e5c0ce32dfc577a7905cc/logob.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/20100054309.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fde982e79a248b0ca4f08b2b30d81cf9/75256272488.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/miwidetogelaxerutivu.pdfIn PDF document text
    • https://signika.pl/Upload/file/nogusoxusewesorad.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/kigazodasaw.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210623214826.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f309220a6d399fe00ded93bc2b5afbc6/40061185212.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/dojowizazikubugebojixor.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/774a9f3d1a1f58933066b68d0e8b6ede/nomawijixol.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/89177885726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=upstream+a2+workbook+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_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 17044 bytes
SHA-256: cfa3b4fc081bccdedbeda92b5788668ed087ad89e9edbe52fb591e597cb05fee
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 10860 bytes
SHA-256: 0f5973c6a8fe2cbc872451a3302f1c537e5b018aa5e215c5ece5a26b8eddef87
font_02_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1