Malicious PDF — malware analysis report

Static analysis result for SHA-256 89190d78a4588bdd…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 23:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b23b1f8153b61ae3fff65921663cf00c SHA-1: d2088851d199df89882baa6402b629b9bbf437f2 SHA-256: 89190d78a4588bddfe4012af22c8bbb3093fede42736ff32f952c8a061912db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=from+sand+and+ash+reviews
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2i9g73kqk5pdvkglp5rd9djen5/15791847953.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/jotedijunanofakuna.pdf
    • https://norservis.com/files/files/34352027105.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608501d4cf920---76662400568.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1a5287ae---dukazixikozerufavires.pdf
    • http://automsystem.com/UploadFile/file/20210603145117955.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cea2e6f4e---fovesuze.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d07e02974d03546c66c2381197c1b9ea/xewuziladewizuleful.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/eb96f34fdb3c8df8132b4411cf8b850a/soninategusize.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/3ba8d1722fa5ddfe7517cac26fdc6f7f/wegaxomanuwupefafibipi.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e96340a0b---96998007215.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/81c1be702c85a224910e93eb9ed2aa6c/marupigaxisegeredumoviv.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc20a5f193---zejiwejobuxurerizaler.pdf
    • http://cupta.org/userfiles/files/20210624144720.pdf
    • http://www.heksan.com.pl/file/87546733640.pdf
    • http://amandamaitland.com/images/file/wijabibeva.pdf
    • https://bamfieldrental.com/userfiles/file/95463823965.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/577ad50035a909e192d4571df0c5e760/29346106560.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/27d89f2c16bfed6798e3ea4fd7cc5acd/bajawote.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce346fce0d8---53613956312.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087116a9f95f---12260459742.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/v8m56tf3me0corsm51qm8b6fj4/tepuvimovimamujo.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u14h6p24rb0qikhu9e5uec98v6/rogibajuduvemozeku.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec76e5c7d35df7183f94a26cfe4b1cd1/xeranalogokupexitolibif.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/74196889819.pdf
    • https://cgeminfos.ma/upload/file/23650621352.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/190a940b307d147ca9ae956e240188e6/21282664050.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f553.bin
2678fbb6dc6a79e85b0c40e55c0406b1db334fd4e4d2f0d4e318ac99c2d5b5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 17204 bytes
font_01_sfnt_off0001212e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 16792 bytes
font_02_sfnt_off00013945.bin
03e758a09fe0e765fdc2a86836dd30bdcd41307faff5b9d3a08235f3b30593e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 10496 bytes