Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b59c1f902d8a109…

MALICIOUS

PDF

91.6 KB Created: 2021-07-13 09:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3933869bea87c7ffa4b7ff36b0cf18cf SHA-1: 0b21874ffbd8e935640c219bf84fb480aebe5995 SHA-256: 7b59c1f902d8a10947347031065afc5dc15a793c56c6f09409cfbd7bbfdbf7c7
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs pointing to potentially compromised websites or disposable hosting, indicative of a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further support the malicious nature of the file, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=death+note+relight PDF link annotation
    • https://avenue102.com/uploads/file/zevezi.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/70733691346.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/jorewuxoveri.pdfIn PDF document text
    • http://jarosi.hu/files/file/3404739267.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/muwujadi.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/reremitenunodavevag.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/647af80d76b96f39f30347b6545839d9/52037041489.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/iet9p0ai8320gton00u25pnvl4/runomojiwoneti.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7997d5b985d12495abaa0a48913b3ee5/77550054085.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2319fa4d37---libime.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ece1ac9a---bajerekuwafalivagi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uhcai249de28820p812s1jn7k0/52849669065.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082781267a64---52714672056.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/27762954890.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/xogavogoworizawavitipepax.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dca6317fb8d---96532912775.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/fafal.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nn29at3qven7886jb0rgj6agps/vupanafowozabuzunukuwip.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/ee667480d86b46e520695d81fc22d531/12092390018.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a3e0930b78b9f825e2f25ec420f28dd4/19220039179.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/22921936749.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/92383633861.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nipaveto.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aa072527e---daxuli.pdfIn PDF document text
    • https://www.movementmedicineassociation.org/ckfinder/userfiles/files/mifaloziw.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c35ca0568---zavisebosi.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/19b3n9pmn1sasbfod76bs1fcih/42214977864.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10220 bytes
SHA-256: d2277e8b02ff1ea897ed477f974033155b632bd36f6f8889c3036f071f384de6
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 4792 bytes
SHA-256: ec694a5a5c6bc0436c140731ae7b444bed8934d19b912197814687f0ac49c983
font_02_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECE 19144 bytes
SHA-256: e8933f91604b0d83b7060773bdc7e74d1b1a7bfd5f7e60eb0e36ab70b4a250d1

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