Malicious PDF — malware analysis report

Static analysis result for SHA-256 350ac50508280934…

MALICIOUS

PDF

94.8 KB Created: 2021-08-09 23:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d45c8c3ac816f3d1bc2b2969f1555816 SHA-1: b0a1b4fd57c09f7014d8a9e973aef1c954207f24 SHA-256: 350ac505082809347b7168db28a544f06029b21095a6de6d9ea6f77322c7b1a6
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mimpiindah88.com/contents//files/borojipazabexozud.pdf In PDF document text
    • http://ltptech.vn/uploads/userfiles/file/metagojuni.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/45i4bof05k0dop6mp0rj2lh961/xovumatogu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/kunasosewexazopopewisep.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e4cfb483a---dagotoxiguvewezasi.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/bojegexezixifuvufu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/73828689799.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/xizaxivemuloso.pdfIn PDF document text
    • http://www.siposferenc.hu/html/43159855970.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/92894280467.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/36194713566.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/tarebuzimenezukum.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/2e0503449cc8a03667912fb27486923c/parevejatebojozamubog.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c4a11a3f7b8c23a6d73c73a08e7610f5/36403196648.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7279389f5---sabusekitogikeloxikudew.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ma3jo2o3r472srvnkhdt13h6pl/91079641846.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vutifilujo.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/815ef5bdbc895cf71b745947b60b8a8e/19885557722.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zezugenagubewilof.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/muzuti.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4e50d49df37fc7a79f769f1d27ffdea0/volijosanulika.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/8946394647.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/67788180198.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3639c406db---39687552127.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/83567946687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kinemaster+latest+mod+apk+4.11.15+digitbinPDF 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_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 17484 bytes
SHA-256: 45127f128005d4fe89c73088b10f67e24399584d5778bf4d20807128d2235d1b
font_01_sfnt_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 11288 bytes
SHA-256: c58fa03f77315cea4b3925a11350f69e857b58f2290c84e6ca797be57ec37c4e
font_02_sfnt_off00015418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1