Malicious PDF — malware analysis report

Static analysis result for SHA-256 19faddbbf272b502…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 07:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59da910ed96478020e81c902d17b29b9 SHA-1: a11bc24c05ffad2f6a0ee51159badc88654eac1e SHA-256: 19faddbbf272b502f2bcf0634e5eb45a8bae80661fd0a8799f4e7fb58e0e4188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://pistant.ru/uplcv?utm_term=ifrs+in+pdf PDF link annotation
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3id6em69psm2iq9h1p113375v8/zaxozosabofonojiwod.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0aptgoi8276hrbf219gc9s11k3/38070271749.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/41149548832.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef87699985---87510892644.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bbfd6b0fa---96955077389.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dujigosutes.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/53386056210.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/geduneluberowixi.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/53645550945.pdfIn PDF document text
    • http://plncse.hu/php_data/file/bininixokatupule.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/24021630033.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2c70dd19---61115284476.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/zokedusejelonujevedalo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/63416508430.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608579af8d7ab---33606529671.pdfIn PDF document text
    • http://erictex.com/ufiles/files/43714828316.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/23488579614.pdfIn PDF document text
    • http://hodori247.com/uploads/files/nuxoliva.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/68544048971.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21539367733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609029c16c0cb---46372226258.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bfce865bd---34197848248.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0669f26b3---92981979311.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xixepadafanobuzodebuduze.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/92152949324.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/96431691831.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b234aab31b1---tozafedi.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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 17132 bytes
SHA-256: 619ff269d5ae6cdba06fdfa5463a79af90f99593de27549b637acfced45eb0d8
font_01_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 9884 bytes
SHA-256: 18baa3356b41d7c229f24e3a06b6c5a3cb8b62576c7377dd4f896ddba543340b

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