Malicious PDF — malware analysis report

Static analysis result for SHA-256 a084210c29664fce…

MALICIOUS

PDF

87.0 KB Created: 2021-07-18 12:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af4ce2d688cc27fbf0797ec07e35cd48 SHA-1: 47ecca6c2a618cf9461af71bafda6b251b9774f5 SHA-256: a084210c29664fce4fbec53de0ac1ff5de3d40d8bb14a1a3f16fe3d68ff5ea93
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious content under the guise of a free download. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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 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://cybernet.asia/UserFiles/File/nizilevogoduxetu.pdf In PDF document text
    • http://zaun-produzent.de/userfiles/file/98921204816.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9d8eb890---kewegisozofaxa.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1275f575b70d698aff5a845dcc52d0ec/29637069887.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66ef0850a---2594211613.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/xemanofenikerozekofa.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/arntflvg57ih351vnkb5rvvc78/78498196052.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/bagesoli.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nbqj2c54c4un6rb3o3nq2j9qjs/limubefixaziriluve.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/bazizasonaxoposotaxu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083374632d2f---30169125581.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070cebbe1514---duzotulowibexoduriwexepi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/befosuleriperir.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/sujapafadiposusuregove.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/88826418088.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3533d0d---93309763814.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/fuvabixopudivos.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1d40267bd0966a3b7e45271a4f9b87a7/getuxewurugi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160715edda69d9---89708800838.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/jnl2pii85lqq5hp6ml60tr0kia/dujedujokufinazotox.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074835e31e51---18918640993.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/6951816100.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/24143117885.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-31/20210531021027944286.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/zosobolazunodapobe.pdfIn PDF document text
    • https://medius.sk/userfiles/file/78236763151.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/tijiwesamamifireza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=echo+made+easy+free+download+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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 17072 bytes
SHA-256: 0db3a097f8d0695e736bee9044b4310591b921792d0c24f870dde726d0e9951c
font_01_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 10880 bytes
SHA-256: f492850e60642c6b7887b738d09ab36b5ee478a77c66e77859d1017423ebb26c
font_02_sfnt_off00013671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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