Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac491f34948079a0…

MALICIOUS

PDF

84.5 KB Created: 2021-08-20 15:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9f42b8f6cad381db4915e7d9cac628a SHA-1: 2ca0124e07d98ea25fbf5711f178811493aaa428 SHA-256: ac491f34948079a0baa88bb4fa888066f0a649844a313419f57155f7e2669390
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely intended to lure users into phishing scams or to download further malicious content.

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 https://coretry.ru/uplcv?utm_term=how+to+make+easy+slime+without+borax+and+activator PDF link annotation
    • http://szigmetal.hu/editor_up/mijebuwipuf.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/96442773982.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/lepojexubetewerene.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/77436603838.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0cfb3577bb6dab9ebfa022ddfac71e04/72663543893.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/84002007409.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/9494200483.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e61c8942d---94154838985.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/misulofofe.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/gisom.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/55788468503.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/89005479749.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/42264541435.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b8f5890bf5088e5c407ed9766534d1a2/wunopekenoget.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/73568695089.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8340b85db3---56162399166.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f211928dc---38665491451.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/90f1f0749403d1df9e966cbed5e1bcb3/kalufowurevigoroniwimi.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/nikagavizanelonab.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/h70st35c32vub75df269i13a93/revesu.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/gegitonitegezuvel.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/sikudajivon.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/23477964027.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160adaed5f0b83---rejorutemag.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9527a08219---valoxofu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 11324 bytes
SHA-256: 62859ed1e9363f1b75a70c720cd5ac4f1e6394b4dede5e3a165e58310489455b
font_02_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 16296 bytes
SHA-256: f171c319304440cdce08b5629ba1768ac2fc832a934d82147251f26ef6ddeaeb