Malicious PDF — malware analysis report

Static analysis result for SHA-256 845b2f5fb72ce3e3…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 04:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63e7d7fb6f25351c611086ec7843f3bd SHA-1: 7552e60648c3f9b2a2f1c5cb9fb3c8a3f1294b7c SHA-256: 845b2f5fb72ce3e3d1ab895495b3b6021022e503c50cae6e59625cb8bebf800a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be hosting PDF files, suggesting a link farm or redirection scheme. The presence of a 'Download' button lure and the ML classifier flagging the PDF as malicious, along with ClamAV detection, strongly indicate a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://foodchemsino.com/d/files/xejuzumap.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b8884cb56fc115d5263ede13855d1c99/ribotilosupuropisola.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/50558832292.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/pomalepaparodulogidujesof.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/67652d609ae3680c18788c18ed7ba9e8/17934566037.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/22137194219.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/8c4ad4dc9afd323764603c4517b44b4c/sunonorodedajupak.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/18626576527.pdfIn PDF document text
    • http://novafish.it/userfiles/files/dokejidojawijajepovo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724abe339b4---28993130420.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xulubujategore.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/140d02c8dbd5ca89c01749910a240aaf/jerutanalodirefosipowivo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba334ed4773---15468452174.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/18007315216.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/gomofilopupupitawuxizede.pdfIn PDF document text
    • http://sgpeo.pl/users//file/61150711527.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/57b3288c290f451fd2a30b7f693a2476/56767337636.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070310011498.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/vanabovavosewa.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/31791214280.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/47763547191.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160944a6ecb438---lusipekozidisuxokeruv.pdfIn PDF document text
    • https://digireg.si/upload/28790419707.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/16372335943.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/23039330665.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/fewawinovowoguzaxuvubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ap+dsc+tet+previous+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_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 10612 bytes
SHA-256: 456b0f2b04c0547538d659fb54c9a4eee3f99a5d8c9004bcda1c753f1d466d90
font_02_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 18548 bytes
SHA-256: c1994d24a61f5616a00ffa1ca5c8caf53d2096b0bfbfd442c87f852476f06430

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