Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc6797a5d96fa12…

MALICIOUS

PDF

73.9 KB Created: 2021-10-10 01:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2177418eb4fbbea77c0c24e56019c09d SHA-1: 182c458da6223058562634b3ffbb82180668e6ff SHA-256: dcc6797a5d96fa12dc9428bacb61e17cbef16743a2a5911656f70a0018466240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, a common tactic for phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure and URL patterns suggest it's designed to lure users to external sites, likely as part of a broader phishing or malware campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=the+role+of+decomposers PDF link annotation
    • http://precisao.org/files/files/61840963979.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/20593379390.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/77748218917.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/23334140002.pdfIn PDF document text
    • http://goref.ru/files/file/52072923815.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/22777759481.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tukegesesutaragujenalut.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/jumagamokimugubogo.pdfIn PDF document text
    • http://marketingnews.fr/images/file/mofovaligufiberibu.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632254878_715cf86aab.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161560a58958e6---47590664719.pdfIn PDF document text
    • https://thepainter.asia/upload/files/guxavugizololedaburuzevo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4872ca27b61bf7a62b87a26d127abfd/lapevim.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/bumegusolawarofejufojo.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/tazigegase.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/97471201424.pdfIn PDF document text
    • https://icbacademy.com/upload/files/82934404598.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bkfsjrg0t5j58n8q5nmdu18ggj/dalakosivokofekogapo.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/ganoxebeve.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/99nmmnmpdb5caj3lu0hpjtkrme/dugezutixopazadexipojavuf.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/risegofawugopoz.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/93934926510.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/21188511639.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/89886611065.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156ab58338eb---nuxujofolavaredosimu.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_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 10392 bytes
SHA-256: 493721294179460c1f3119f287d5d52501cc724a81153892861e6d6bd751fd19
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 15984 bytes
SHA-256: b9df6dc3b2e6c9f86c0678fc7d16a738b398268dce0f1945aff1d8910629b43b