Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af65f1ce479c5c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 22:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3286a0210fae270ec074daf44666777f SHA-1: 48e3256f40b569b6629a369139156f53a71c395c SHA-256: 85af65f1ce479c5c29fb165cfae7d32f89217b4abf201197a5f34a73abbf5ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, with numerous URLs leading to PDF files. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it is designed to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaba5c3ce8---weloluvefu.pdf In PDF document text
    • http://sellmysayarah.com/userfiles/files/dizuzejigavimosafupuwumi.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/64824565818.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725824561d7---vifawuserokurolinalulo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099103b2f0b8---dedudomo.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79802202648.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/dupuse.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/sovizitumapelisirezoluf.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/68507005068.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/xovuxoxolaxake.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/94304019298.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8adc934d224c4a08ee5aa1c9faa801ee/katemimonitunepafide.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8303d1259a---fuwibuxotaxoto.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/50534768480.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210728_87D9C2068F0B24C3.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/9728355922.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/rurujufujivowepoza.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/e1k7u5mvg178f8ofna63v9iotm/95488850808.pdfIn PDF document text
    • https://zold-kommando.hu/files/88047646049.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7dc3a293---tugurozux.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/97713679364.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/55462405294.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/9821537813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+3d+photos+on+iphonePDF 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_off0000bb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 10684 bytes
SHA-256: c5b2abea6b6460cc8351d8144eae72410c0b2548a04483b06c46bcd86bc39718
font_02_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 15624 bytes
SHA-256: 9311d7d89cad3c19b0e0ba6ea6d07375128b5f5dba1b7ee115a5f42cc551df67

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