Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdc034fa0fa6c52…

MALICIOUS

PDF

93.8 KB Created: 2021-09-12 01:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08e0dc5d9aa377e89ced92bec6506090 SHA-1: 9738ee234b4e970101e26cb6d4ee28d7657f5c84 SHA-256: dfdc034fa0fa6c52f7410965677a203b6d425dbe6b019850ee8b37427faf099e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, limiting the analysis to the URL structure and heuristic findings.

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 http://skogsformedling.se/bilder_umeny/File/lulimimezat.pdf In PDF document text
    • http://akvatoria.by/UserFiles/files/31923828319.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/sekunekakelavogo.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/27122059733.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/gulirudogilakenaliziwitir.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/danotinejijebumo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8a60ffd8---setetezulogivatigol.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613709e3b6d50---70246218174.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ed8a33198965c04c60567dec434bff7e/xogijawagefu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///viroxavatepofenigi.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210908155347.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/25827661641.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/19903320169.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/bajopurasadiwadimadorav.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/kapefunatadoponadetatow.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/65637729882.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/jipobujalo.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/51167389754.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/29450948218.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/hdij3i0ll714sgo4sf1o5ujbo3/regabogomibi.pdfIn PDF document text
    • https://geloracinta.com/contents/files/16039071814.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/33542193744.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16138c64fa8b09---mafemorema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nuclear+physics+questions+and+answers+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_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 11140 bytes
SHA-256: fb835a2794619c4d0b30bb2370ad3848e31604cdcd516d76ac7fc1be19438fec
font_01_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 19384 bytes
SHA-256: a9f94ec1435b238362b32f67905d93cd690bab082acf70a7403c5ef3687f1f1d

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