Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f93a1a5511e60de…

MALICIOUS

PDF

87.2 KB Created: 2021-08-07 10:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 809b1b1aafa7cc546d780a43c08643e9 SHA-1: 1af1f1805a8be5cd20439b8fc69d357bc120ef44 SHA-256: 6f93a1a5511e60debe1957e34fe83f84598eb9d68a7d8846281d17979ca6f684
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or unknown content, suggesting it's designed to lead users to malicious sites. The presence of multiple external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://micast.de/wp-content/plugins/super-forms/uploads/php/files/t152ksq566sil76gbekm5b8bas/mogasejumiliful.pdf In PDF document text
    • http://andlupa.com/userfiles/file/girusifodep.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/sapuwazukapuzu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db53f47dd8---xujeledepolarodabik.pdfIn PDF document text
    • http://kasargod.net/uploads/file/33318668726.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/59595838351.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae5a0d562---bulokipapajawudumireko.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611102106845.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ce1280b2---rijomajusapoxizefirobosax.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/jemozed.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609266b95a6ad---kepisiwozetoledolujivotu.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/45049523294.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/95887191641.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/sudutunidavaxokavemudi.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/84a392dc6460f0b6271d2877a3345876/12249871900.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/234f428920b22b3f6fcdf676019a3a9e/vuvaz.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/26287829480.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9f94c26286bf24124008ad183beee028/guveritipo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5364d7a0b---pidupovimotorivede.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/26124571842.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/66882197856.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/48420598173.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb6b24cc3a---68114677151.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/gogolenagedijuz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b2ce7c94980e0a5b46b1386f75f08b21/laraxudosag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=paint+the+town+red+android+mediaf%C4%B1rePDF 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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 17652 bytes
SHA-256: f267bef14c27096594ec984394be5e5649793dd60a3503104697d051de3b1489
font_02_sfnt_off00013437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13437 10540 bytes
SHA-256: eabc6abef6d52bde2f473b7660936cc8cd1337d9bcf94904b851a9de53809527