Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7843d1bde601249…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 23:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8193067c5778d93137f51fb7c45689f SHA-1: cf3fe7dd82a48e031d9f3dec8112810887155759 SHA-256: f7843d1bde6012495773efa143f88f27dab25c97050abd28bfe4ba1a6a10108c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to disposable hosting or compromised CMS uploads, forming a link farm designed to redirect users to potentially malicious content. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://queure.ru/uplcv?utm_term=the+walking+dead+season+1+episode+1+online+free PDF link annotation
    • https://mbzgogo.xyz/web/img/podborky/files/37762642464.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/wenoji.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/71080964687.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/sesukesoniruzonomida.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/61356057986.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb95c58da---ziwekevubomuzatiboruxan.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/51734393876.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dad6001d82---rabuwani.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/gekaxukutetuj.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/67801436092.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/20040840444.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/jowosizalidizeweki.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/97842420087.pdfIn PDF document text
    • https://birotex.rs/images/files/84345630999.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/79418d4d1cb3b676c87190ed45661927/soxowunabowunige.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/58091320213.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-1/20210901233410800964.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5f8f4b5456fbb4559ea5a4a0b5d498b8/57280095361.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/85391882329.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/70930446071.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/21508946022.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc01fd82e5f1537b0967cab7a67f5622/fidurifamurebonelege.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613738b4435ae---74283097290.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/1801785209.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xonuwexapev.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/77795806943.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/98000019928.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_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 10872 bytes
SHA-256: 9b52f8b118bee8d9fdd405810cd413646514eba286b217d35de57a35749d0dae
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 20052 bytes
SHA-256: 76f4632edc95e7fbd130d6442176abbeab4e99a956ff16c7cb8ae3885978f83a
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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