Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5514b7d8a948733…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 04:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aba27662086ee3e1bf111758dd8652d3 SHA-1: e7bfcc213992e96bac3a8e1b69310afee4a9166f SHA-256: b5514b7d8a94873375f61428421c7e37bfb9b0098da3207ed14e70a1be98b15c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The PDF_RANDOM_URL_LINK heuristic indicates a direct link to a suspicious PDF file, likely a secondary payload or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=usb+screen+sharing+android+to+pc PDF link annotation
    • http://abwpetersburg.com/uploads/files/livupibetifemunateta.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/65365474470.pdfIn PDF document text
    • http://jawarakreasi.com/file/64271706941.pdfIn PDF document text
    • https://andrejc.si/files/file/safojobimi.pdfIn PDF document text
    • http://fpole.ru/sadm_files/kexanodabusizo.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/maguwonuxirejusanuvuzosad.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/78772762138.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/nilozuseno.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/setev.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133348a5d9e3---70176385652.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///40477233601.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/tomavawililivilimu.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/39865904093.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/4707685199.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/logamanilovuwinutaro.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba87fe6a6b---3063030149.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/dotas.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/fomumuzogeneletakidosez.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/sonuzanonekarase.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f300ccae81---befubegewadinatizolapux.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/90978983281.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/69630790858.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/92904990512.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/vuwopupeke.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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10892 bytes
SHA-256: 3129af450158f847c95a20fd1de58e42664631691e05ce9ff29733dccb997abb
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 17912 bytes
SHA-256: 1365e65da8e5213101cafc02c50c0ee30ae48fcde45243c2af93866e0b70cb27

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