Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed91fb0ebe2bfb0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 03:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 838c266713b48e6ca298653d16e68967 SHA-1: 77c2003780b11e5bb55dbcb8b72b63afa2812404 SHA-256: fed91fb0ebe2bfb0859b39b34e961cec021c72a6639d2416c2fd6818bb07fadd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.donboscovizag.org/images/files/3550906863.pdf In PDF document text
    • http://koreaticketland.com/userfile/file/96308398775.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/51010543403.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec240806d---fixemirimizinu.pdfPDF link annotation
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/revafuletujozatituteberi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7d20cf4755165f79ae4bd9d62c9b0f3c/dejilemirebono.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/nakudotanegezepoxuruwo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f83a51c30---parogata.pdfIn PDF document text
    • http://fnathservices.com/upload/file/rizugodowo.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/bakozusoxifusexu.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/livawipejugosot.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/90254947033.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a770e77af5798b986d75e953565b4b3f/98537495567.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/23748965145.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/77387255584.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131712d798f3---84487135297.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/10531108864.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219165368495.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/zuwibulifaberijamuwewo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/26423961094.pdfIn PDF document text
    • http://qwerty.pl/_data/file/dupalivitogale.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/xanonabonipavorolalix.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/dufuvopivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tom+and+jerry+the+movie+newPDF 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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10656 bytes
SHA-256: 6ad0a07962e91b21d1f23ddf091924ef2b67ca9ca706aa06a55e98c898cb0d12
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 19344 bytes
SHA-256: ff91e4e7677088fe20a18b404fb2b8bc0a3fb7245875c948d32538fa0001adc9
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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