Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fdf07b2051a2d7…

MALICIOUS

PDF

98.5 KB Created: 2021-07-17 10:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65dda146031f78bd81bf64ec2173e277 SHA-1: a031aaac8d24e43fd0a63dcf0cdee9157cbd0fcc SHA-256: d6fdf07b2051a2d72c160c6c4a60990ecd8f6914756f64d61df94ff0639105ec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external PDF documents hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. While no scripts were directly extracted, the nature of the links and the heuristic firings point towards a malicious document intended to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f919a6171e---63759707805.pdf
    • http://gyobel.itpublic/file/xozexitezodivabinuv.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8vscknihls1ntquv3ubatpmck4/pamagakivajugi.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/18184229708.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607086da800b1---53250988806.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ac37413a2a3e5f6e40ed00c1d42c0c99/49490747530.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed29d9f39---69701625907.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8509495b09---96210553272.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d56f3137f19d38f7f7c11280a299a840/fidupizivuvikow.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e47dc3781---18650304700.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77e17431c---jemazinok.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/motadu.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/62564691769.pdf
    • http://zabradli-znerezu.cz/userfiles/file/lewinepumi.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e4e077112b337ce9defa2e2fcc5ade6c/86082450166.pdf
    • http://ilksolar.com/Images/Media/files/sofar.pdf
    • http://namthangbasaltstone.com/uploads/image/files/58117484918.pdf
    • https://confetti-seasons.ru/upload/files/linijowefojinupe.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf62a1e885---69063931223.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/gojibamemupuwevoxogo.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/e527s26u5jdmpj6pg0l61m0iol/90259843308.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9146d9aaf9ffc1060e9a25441f87089/34640303116.pdf
    • http://ever-pioneer.com/upload/files/kukofunoraladu.pdf
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/95346057074.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+pdf+less+than+100kb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d8.bin
6ba374b5ddabaf49767ea7a38bccb12e4c4c6f68e9ee2e234e60464cbddc018f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 11056 bytes
font_01_sfnt_off0001213a.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16144 bytes
font_02_sfnt_off000136b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136B9 16792 bytes
font_03_sfnt_off00014ecb.bin
093b40f2389f9ecfd4be58d84bd8066fde40cf6b2216b90b4f576107eb00fbe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECB 17316 bytes

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