Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a4192054e3c886…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 05:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e27ec40fc67e114ab81a77530a0b732 SHA-1: d49eee947452438a3cb90015ffdc18105b0be1ea SHA-256: 44a4192054e3c8867bde53a1b86c3511d2e27f967256a617654b63f9bca0b797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chuanghuilaw.com/filespath/files/20210908091717.pdf In PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/29443370321.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348025b06dc---42370146559.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/42270791315.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/86867896674.pdfIn PDF document text
    • https://85097781.com/upload/files/rojuletuzaxetosafoz.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/86cb90b99c1edf62f6bccdf92d0b0dfa/kuravetof.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/ropagevojixitigulokez.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/gemuvul.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/2262362954.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/82390582162.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/17430616166.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/jiwerofofinefadukovazo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c315d7ee322aba16872c2c9e010915ea/vafuzunubijixa.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/lubupolodoso.pdfIn PDF document text
    • https://panoramabyty.cz/content/87520775523.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/88352630738.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210908_B1E7DAF337612DC9.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/50658423156.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48712120232.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/xugibesezuvagi.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/reburujepu.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/rixawowuloxev.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/49147463968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=championship+manager+18+androidPDF 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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 17940 bytes
SHA-256: b673699ad8d3098be268aa3203888123b5e87029573ff7469bb47273f2fcfb57
font_02_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10984 bytes
SHA-256: 845a85e8c46a8842910713c7019660f2ffbf2cb3f903ce3e463d8ec20cbddc51

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