Malicious PDF — malware analysis report

Static analysis result for SHA-256 788ac5f5d0290d17…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 14:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ffcdfc84c106cdbd2a56a1d815cac24 SHA-1: 8ac0fe85c90ba2f8dc87b5bb9d37b8aeec62a868 SHA-256: 788ac5f5d0290d17923e39b2d65c6da9a9a1e944b71decf66bc25bb5695918e7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://speak82.com/_UploadFile/Images/file/jepetusemur.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613694d435fc6---denaximaj.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/penixuborowopepakojidig.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/mevonikotujuveron.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/62246044188.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a415c7e789---rolinemokin.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/89152920396.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/sevukolubediwemapipekolo.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/80045077905.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/46220cec53a35f25e48a51285089c50e/nepajuzovigitodosijan.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/1341076280.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/84969392402.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/36861734081.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/sudoturegokamepajese.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/82531557739.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/74013103701.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///lumiwavozuw.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109021657032825.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/nusedarajuzagikivuzavenot.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/96340052087.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1aac510b2b1714f4cacee143f07da582/kukalozopegemu.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/faxizonex.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/wogagikolekukilewikidagos.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/lexexebuderijiduripa.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/meguma.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/49161037215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jurassic+world+online+streamingPDF 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_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 10892 bytes
SHA-256: 1ab174f0e67b07b01b83c41a40f5a180c4f43df5d93959f2b9c86434f2a978f1
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 18056 bytes
SHA-256: e05333f81ffe3f290e739ecda926024501c86fe0c45103d1f5ab18ad835cc420
font_02_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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