Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e101bdacbec03c9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 04:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56c045e7def9c7eb1d5dae019c60d738 SHA-1: 60f84ac9fa400fb919027c9b382fab1a631aa7cd SHA-256: 7e101bdacbec03c92e5ca15a27bc5d26d0a1d93ad9ccb562a96e269b48400592
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://constantcontinuity.com/membership/data//files/nepozosoka.pdf In PDF document text
    • https://anfauglir.com/images/file/85380625430.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/vokijabokotumivoburutusux.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc557e11b2---12092041543.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/sobuj.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210815231435.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/zipubetik.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/3018123110.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kugowukedewafonu.pdfIn PDF document text
    • https://motiv8workout.com/up/files/sogidu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6ce2e888dda21c5480b5021c7e2faa96/92009888110.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/1uq1mrm3pe7t19lqabnu7to95i/zegedagogale.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/wilalupo.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/52300404002.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/furorosed.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609837a81f0bc---gixedimisivagip.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/68636647663.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lutogikireg.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/69650151538.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ov1b61nvcu8qg5pvq54mf0d7a7/85525143502.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/64417704954.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/mabolugamagiwuwasikixema.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/damov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=toyota+land+cruiser+vxl+manualPDF 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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 17140 bytes
SHA-256: b4a1a930785b02c692c35f1f75b6d216e64cc71b1ff0a4daf21cba6ccc34fe1e
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10876 bytes
SHA-256: e2004d6413099a2ead2c26a908b24e7ce88e1356c8d5e49beca0d6ef439f0d3b
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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