Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4cac210a9be5d7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 17:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 055d30825e9efd4f2079c04e0bbd7e93 SHA-1: db926058bf54d55d391e6a31473499f2e33b04ea SHA-256: be4cac210a9be5d7b324b9fe32847256bd5b573983bb7a758fe5c1e463b911fc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external resources, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or further payloads. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://stthomasorthodoxchurchsouthpampady.com/userfiles/file/tazerovitanelokojigawawo.pdf In PDF document text
    • http://intemhathanh.com/img_duhoc/files/nijevasu.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/lititepodubakexuserugam.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d16eb716590d7dc632909c88d8b09aba/71296483607.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109040444087455.pdfIn PDF document text
    • http://netwindowvn.com/uploads/userfiles/file/58042902540.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ap9stotiqthtra9mie96dbi823/6349675001.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/92301891278.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/fomewomosiradamo.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/datexonazo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/k1oidg02k6jjigivqg663953q4/63393619599.pdfIn PDF document text
    • http://underbutter.cz/download/foto/zijogilimiw.pdfIn PDF document text
    • http://congtyvima.com/images/Download/vejulozogexamukizosomesen.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/491660084.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/60061736543.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/wozeru.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/80976248925.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354699cf0ea---92760891636.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abff56d155---bivubuligazakajup.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/cf91b946a44594fd2f923805fe6fec20/48401540956.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/vimitir.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/fefenemo.pdfIn PDF document text
    • http://hak-al.com/resimler/files/lefonofurivefasusi.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/29241630062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rotator+cuff+tear+diagramPDF 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_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 10644 bytes
SHA-256: d8f5477e1514fad04b013588df79f7bd8e57a768b595fa86c011a455252ab58b
font_02_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 17276 bytes
SHA-256: ad5f9230c554c7b9651afe8b8206b6b5ed4e86d9fc4f705145daa0f661867e35

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