Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c41574fc925c47…

MALICIOUS

PDF

80.4 KB Created: 2021-06-18 05:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4e68936f49637e47994020409470a264 SHA-1: d5056fd58a120124969bc814bb8374040b8bf644 SHA-256: a5c41574fc925c4738a8380e826adc5bf09f16a00010b60b790aad305d334e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to compromised websites, masquerading as a download for 'Office 2013 language pack spanish 32 bit'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the heuristic firings point to a link farm designed for user deception.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3ff8bd92f72d3da3fb9b81331419f196/xigovelev.pdf In PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bab95a4e366b6967d03fc2545c8b167a/35566009755.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/064f78dd1d67a29fb6dd86d26904225b/zokanazeranekulot.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r29lofilk1kgfghg69n9g62uum/25129203703.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/974117ea4e4f16d51cfbebf7614a0122/dagifiviketufabakomoxofe.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/dolefubikoninalo.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/susemotafi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/getasisuve.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/watug.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f6dlc9argdj8gen415eg5f5nl4/96091469820.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/32074473537.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6301c2daa---gemaxinesi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd06550a4c---38382300065.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6f234a8d035929ca99ee96a88aef87f9/3496985059.pdfIn PDF document text
    • http://www.heidoc.net/joomla/technology-science/microsoft/73-office-2013-direct-dowIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=office+2013+language+pack+spanish+32+bitPDF link annotation
    • https://mediaget.com/userfiles/files/nasipoluwuf.pdfIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010b37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B37 22556 bytes
SHA-256: e37866eea6419bcbd9453496de56abd81e4e33eaa32ae26677e9e414d14967f6
font_00_sfnt_off0000c544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC544 3804 bytes
SHA-256: ac150248d268ffe09d64ef3b5bb899a9695a6a8ba2c7b1209ee90d28001f2f60
font_01_sfnt_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 5904 bytes
SHA-256: 5c55a0893d432176df617f506a64f0ba352ac92f9d5f97e6964dfb6222e400c1
font_02_sfnt_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 10548 bytes
SHA-256: 9d8931d6327369943cd8796ede06e9bc6a561a9d1994c4a1061e1481871668df

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