Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6935f94d155b6c4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 17:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91ed6d7fe350682bd51a4727d263b048 SHA-1: 48d7752f28a8c897e0bd01cd4f24d7f34d9b0aba SHA-256: a6935f94d155b6c477ca0899cf53a5bbfd581a8033500eb61add078f7d202e50
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to unknown or potentially compromised domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://jszl-rolls.com/filespath/files/20210916112913.pdf In PDF document text
    • https://srilangkapools.com/contents/files/lipuvitujepoku.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafeko.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/nowidiseputepabok.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/9dc584d1ea0c5bcd83ef1f586d34372a/wuludugovelevapen.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/lixaxomarigowab.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141462538938---74276273845.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/78055114008.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xerunazase.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/fefesowipakivitojupefu.pdfIn PDF document text
    • http://foodchemsino.com/d/files/sepenegolalibufafoxexo.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/50108338897.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e505fa85a1---ragusagemodoxujatugatelo.pdfIn PDF document text
    • https://ka-base.no/images_content/file/vivurejukibulobojetuwo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/99660094110.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kumowagalixorukabusev.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/giximofijazibupejevujolu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615588afd0bcb---21784965231.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/fc7562e47151fe5c593e24379b8cf416/fagelidanezisiletir.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/14111414721.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/037e7e506e62ba5a7dc8906f0f242cb3/fevonivojofak.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101644488239.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/51395309345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=essentials+of+medical+microbiology+3rd+edition+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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 14748 bytes
SHA-256: 9dad1a83694ea143b1136ee7010e5f43b02415580a41d05b185942f429214958
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 11372 bytes
SHA-256: a2629e95febf3b14372bd6fd79bc5b94dce1e914673b58ff096848b2786ee85e

Open this report in the interactive analyzer, or submit your own file for analysis.