Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e2feb1c5d48581…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 23:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce3c45a1771b650d2a3b56b7f49a9b19 SHA-1: 3f2f171b359154fc463fe91c396cee7806c9c315 SHA-256: 94e2feb1c5d485814d957ed7c683875ca94281433ae093b0c91cecf874c5c923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=digital+integrated+circuits+a+design+perspective+2nd+edition+solution+manual', are likely part of this redirection scheme, potentially leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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 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://crysiq.ru/uplcv?utm_term=digital+integrated+circuits+a+design+perspective+2nd+edition+solution+manual PDF link annotation
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2187dc06---fufezifejifunufovurafo.pdfIn PDF document text
    • http://lblussana.it/images/file/welotajiriwenasopiwabab.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/59470604739.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/40425881302.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5ab061b4---zibativi.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/43303051415.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ffd005a10---42905859931.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/xukozemuno.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab08f07ddb5---4804476842.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/zomejezulujibad.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/togijimulaxukuduwel.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108150951383550.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/36634888715.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2dc4608c88067da728d2cbd008b7014d/51078943664.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1c92578a---3029959529.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/97ccfe3d66765f6eb55a7b8a6446193c/kanul.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pn9vp0argktih8d7bjiov2gfck/jobosonaw.pdfIn PDF document text
    • http://master-br.ru/img/file/xanurovita.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/45211519743.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6fadd92d---64085978427.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/wexeja.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/69149748712.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/41316384654.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/75271487068.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/33e867e91edd5f1d5b7f40ffeb3db290/dimosege.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/belalu.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210811_C86D474E678B4750.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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 18876 bytes
SHA-256: 15989b29e5d10bd6ebe6c45b7ab6d2de79a43c34b699d679eb45f5bd704c3290
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 11144 bytes
SHA-256: c3781d1418f2e40dfd894daf8ac6f711efd6bc5ba9abd9c6653fcd338767b513

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