Malicious PDF — malware analysis report

Static analysis result for SHA-256 f736df981a2090c9…

MALICIOUS

PDF

92.8 KB Created: 2021-09-10 02:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38d57062045c12180996a753c6a4ed55 SHA-1: 600c6ba6e925eff6e1246edf25177714033a4e21 SHA-256: f736df981a2090c9ee2d7da87450795355541674739f915a6a66d84379518030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jtr49uvgkmt3eh4icl51edqev3/laxorifatumin.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316dca4b268---63697625984.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/jadetegosexar.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/runuzotanowiwufel.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/xewilowilasusukadesaxene.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/japosoruw.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/20136044534.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18329908000.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/55740412952.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/8530412336.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/vowajusizoxi.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/77920659548.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6f48f9c60e0df53cd5e5741876cae8e3/mejogugad.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b3367e4f---dezoxixipixilojivudor.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/jokemugawev.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/12763973465.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/dafuxogajav.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/titunusubivagumuxirupun.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/suvazunitabapowanaboni.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-9/20210909180107390720.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/gevifibubajule.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/4996055645.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161339a85dfe0c---3377599224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=2021+cricket+gamePDF 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_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 17984 bytes
SHA-256: 72a8ebca26b2596f2526492c5537747f0fc1ea37c19ee67ec36e87333cda0139
font_01_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 10424 bytes
SHA-256: b10dd3231b4a7357eb97d0f6c7a1bff9e5df3a0a70d681c7646cae5a6a7b68e7
font_02_sfnt_off00014e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1