Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc23598a7bddd552…

MALICIOUS

PDF

104.8 KB Created: 2021-07-16 01:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c9c45e6fdaf72b486352bf6345f5495 SHA-1: c972a7f05670be4657d39bfe1df86deceb0b469c SHA-256: cc23598a7bddd552e8853559f6cefd34b1af9c5e5135ac35881c30fd67f92dfc
156 Risk Score

Malware Insights

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

The sample 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 upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not clearly indicate a specific payload or action beyond redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://vannordenvastgoed.nl/userfiles/file/54012089461.pdf In PDF document text
    • https://keongracun.org/contents//files/zivop.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cdf80fd447ee8a3fb898e790b0fba6b6/dozizufaweloji.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6is56gr9boqm5fr131o1j42oe5/70328185685.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/xerus.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0e20e66d---86741493968.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/26373344186.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16b4cea4b---637910796.pdfIn PDF document text
    • http://kme-kme.cz/files/file/2169984692.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ec11dd52---puzutug.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/60254018124.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c883901dc---6820081589.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/xojorevemasemunapusajolo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e1d82af8e---9204408191.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be752047f7a---wefanesir.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a04ce38f9f0---davoduwevobuximasixafoba.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e42e33a8d---ridedejigonimesozoxuvi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2012e3c861---ratazajubaruge.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216211942212675.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609da27739fbf---relosa.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d51aa1c4e8e---6885826927.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/3028102653.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/nugofudamix.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2b7354ce579ab601ebb940ec90e32416/wunutobesuzabi.pdfIn PDF document text
    • http://cartopack.com/Images/file/midalurasuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sql+right+joinPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 17044 bytes
SHA-256: 435c039098c60e79d5e3cdbbab87e78b32701a6fb3fe3a3b42b5bdad6eb0a023
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 27628 bytes
SHA-256: 8b44fde8d646c3a48abaea508c652fc04047f6affd697ab54e20c5775a284da3
font_03_sfnt_off00017f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3E 10276 bytes
SHA-256: 5a43349dbabb2b1eed08ef37375c0ee99b96e42a0176091a18833dd2e44dfe5a