Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2808fa4e2b6126c…

MALICIOUS

PDF

96.0 KB Created: 2021-09-02 19:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f48feb8104563214198c172b37e9615a SHA-1: d354b7a464bc2482dcb97e7b627a6aeb175c0fe6 SHA-256: a2808fa4e2b6126c2de7c10d783f2516e0c9d550b40b336b8ea18db96640e05e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm hosted on compromised CMS upload directories and the 'Macro/content-enable lure' heuristic indicate a phishing or malware distribution attempt. The document likely aims to trick the user into enabling content, which would then lead to the download of a second-stage payload from one of the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://catamma.ru/uplcv?utm_term=como+validar+firma+electronica+en+pdf PDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d745ec0e---50865236385.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021073023365273499.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/38903982754.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/51c3f6cbac0027bf213cbf137af6015d/nijikokesemabu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xexudexabitolusewe.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b47c68782c---gesufuzimegovabu.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/87731783263.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/66500980506.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7eqekvjcev7eh8v4vs8mct684/37749646625.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091cfdae4683---susarivirodosiwogodu.pdfIn PDF document text
    • http://billsky.ee/files/file/55274367223.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/44132811124.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/10860248525.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d9c56790d9b7e8497c432f0f0d445e4f/16642921788.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/detesirejetolijevudaxor.pdfIn PDF document text
    • https://cubic.is/userfiles/file/nowuzadivi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0ee29c816---98936423600.pdfIn PDF document text
    • https://soechi.com/userfiles/file/26504634080.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998aee94583---73597562938.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8auvps81vr0eupi4c3ofel3fgp/zimegogifagu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc52215576---48431313731.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608815ab3dcd6---65250781013.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_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 19268 bytes
SHA-256: 8a702e751edbcacf91e5e62a7c0fa60390c2593fd4c179595c7a85e13b28cda4
font_02_sfnt_off00015997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15997 10708 bytes
SHA-256: 8c0a3ff7cc66cf43ebdb066e6d7cb15c4967f2c074d33560dd99ee7538bc8f2b

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