Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c14a93121c53fa0…

MALICIOUS

PDF

128.6 KB Created: 2021-09-05 10:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a935f60e85ebe5b04ebd8a60dd94f80a SHA-1: da8c59d277b1a2331a0621ba6647ec4d8d1e0e1f SHA-256: 1c14a93121c53fa09b8a17c0d3cab79d3234ba77fa103891f8b3498b51ef11da
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely used to lure users into phishing scams or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://5lovestartw.com/CKEdit/upload/files/98561476418.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t18vcdafeetv796o2h6g2fkab4/91385313639.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/9198651067.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160748423418fc---taxoxatonazomasexofisadiz.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/50673569376.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/risok.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe07aa8a6b---bixasunelavoruje.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wujepawedebadodaw.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/nujozabizenobebudejo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/07ac7f6bd735e9c89a8cb99232723610/mewegidudat.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/bozekofesut.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/dawuberexazuwemidilowen.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/99c98ac252f43a92b98ec9a5ea6eab0d/bonemolarakozuposoraxen.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/ponipitutixo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a4c22912d8f3a788dccdaacfb36ac224/ributenotug.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/53978512629.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ede5b306---xagetukuba.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/lesarazosividuwapugurili.pdfIn PDF document text
    • http://denge.aero/upload/files/8055139124.pdfIn PDF document text
    • https://efnnma.org/files/file/xolupazisuxisadizobovuk.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/loginutawurabuluzide.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/6878468421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=rije%C4%8Dnik+stranih+rije%C4%8Di+pdfPDF 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_off000193ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193AE 18064 bytes
SHA-256: c9d451e4ff0709b9bf6e8ba0b180090002c6e33b28015a1ca160196226f262a5
font_01_sfnt_off0001c15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C15C 10844 bytes
SHA-256: a8d1a566dde42f980c6a750425923955bc8d47a60a9e9619e3fe7fbbcebc8f8e
font_02_sfnt_off0001da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1