Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27dc88ff99daa50…

MALICIOUS

PDF

85.3 KB Created: 2021-07-08 06:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6f9de02e5117d43ed3696b6bd75a989 SHA-1: 0899461c8c55f214e7b092532643b07e4349f7e8 SHA-256: d27dc88ff99daa50f0928ad1927cd1f8801f5a6aa5f96372b95564ffc5b2f9a7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf747cba4---gabanupeposerukopirano.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5ad5f7bb1e2d9c7bcaa6580eeda0e3d0/21762146070.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/91536620106.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/vesorolut.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/dixovuregijisogivege.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bce46694---17964141871.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/70753253309.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/20290982839.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/mijobubijamowikuwafu.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/vugogukisaleko.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3de94618e---pewapelomuxokijobexam.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/91514190073.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/13415189741.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i8f197rvcdildnulnc0d06d2i2/53722075407.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/23621872712.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/60888380551.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/22598003083.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2503c4e356473b5cc3dcf531c0cee59f/1878370939.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/vukuvukogaraximuraxu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/69048965302.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ffde9a36458b2683897cc598c09bca66/67809372331.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689897b206---fusofebipazukapimatevira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=i+am+yetPDF 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_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 18024 bytes
SHA-256: d8a9022b0ab099c73f6b89d4ab9f6e14b68003a87d603ca600e65b75da5ea8be
font_01_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 9704 bytes
SHA-256: 5ed5a320e76ca66d0be8bc05e0f478ea92ce1eaf9cbe58499edf1cd657529dfd

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