Malicious PDF — malware analysis report

Static analysis result for SHA-256 565dfa6fedaf2d7f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 11:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47ad50903d5d7d6d86e29d820696b8d3 SHA-1: 63fd6cd945e8b1952d7eef91c512c511d50491af SHA-256: 565dfa6fedaf2d7fe0951a1003ad06ee7790366cde42dcb17bbe4d72077bfce5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS uploads, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f818cb9e122---mimudofexigob.pdf In PDF document text
    • http://tubietelbar.hu/uploadfile/lilomabogubesiwozuno.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608214e7b9fcf---retagurosigaxelobunodafu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/wofozixigadelaf.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc87ead24b---bovojetopovesimuwimozub.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf6a6bba26e00d6f104370e394468451/66475653121.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db95424f84---82710320729.pdfIn PDF document text
    • http://retrofotr.cz/files/file/69809410041.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/12860272783.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a01bbe93---21949244581.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210901052638.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/88720796533.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b58cb365e87---duzokajesafenobo.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/33484856556.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25b1941b7---16256779494.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be808d49a9c---3278730711.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703491b21ad---62221738122.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/nidof.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081b1a62fe---texokosiw.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/baa5355300e987ce7f53669585732812/wopuxuvodulivujixij.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/rudagugoj.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/24406632478.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab75aa91d---71547460893.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gejoridetorafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vitamina+b5+funcion+pdfPDF 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_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 18956 bytes
SHA-256: 84b1bfe55a20fd752796643e45acb2de322f6451d0ea71f5fd754cc664a7a72f
font_01_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001335d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335D 10680 bytes
SHA-256: e7bd361b574e197f6ae03d59eb4e9a5fa5caa96f2c82afb6f71a90bd9d275654

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