Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ad62fd8f5cf663…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 19:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 661ee0e3a17e2504a1defe751633dd84 SHA-1: 732f091092a7783e8367fa0d953c3473714fa83f SHA-256: 77ad62fd8f5cf66357a342ac0abcdb2155a61f8dd165060d64e2d5117075f103
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress upload directories suggests it is designed to exploit users, potentially through phishing or by serving a second-stage payload. The reference to 'bank statement pdf editor' in one of the URLs further supports a phishing or financial scam motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://primaria-ciocirlia.ro/media/file/47048905168.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/958dl6pjp5mb2bsk44gu3525g0/75951551897.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4f1de7c5---56446917209.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fcb85feb8cf97ac3a4ac097145d14243/gizekefedoma.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/nalapuvunufowiselabuz.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/selakebazevozisonebev.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/xaxefonid.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/poloralipeg.pdfIn PDF document text
    • http://synphabase.ch/upload/file/72341601585.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/wepozetutiwiv.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086b321d1d9e---57770751463.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/vitebafaneluditipu.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/vefevexegenez.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d638fc0---pupurasitulumapudenetu.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/47798619944.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/botimovapajajutopab.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/16794188309.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/buwajumawemekotudi.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/90374808013.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/tabexago.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c0c05e3d44---rusinimopisiserodofapire.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed14cca5216---diniriwarogi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8733f356b516e5afcf1176b7b0aedaf2/kuzadugojotobakumopigowir.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/62971010053.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/dowejenujeza.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/17592952486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bank+statement+pdf+editorPDF link annotation
    • 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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 17972 bytes
SHA-256: ee913440bc886cca37051333454838a093b82df287bb1ca1560b65b21a5df160
font_02_sfnt_off000138ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CA 10760 bytes
SHA-256: ad7c4f6f771696d9a465a825c8013aff0c48c48672eadfaa0b2829731b839ec3

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