Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb94ded59e28a93…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 08:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 326b275eff9dab2e113366af3190c13b SHA-1: 6f0184b9d7484ae47fc10faa0af0ceecc7fcb075 SHA-256: bbb94ded59e28a937f30eab1ae70e708a48d1d00b1f1c7183ec0365aa9612c20
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the document's purpose is to drive traffic to these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2478837bf54112057c82143409cd13e5/jifapogexerakidixamudi.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4126126af---46488567354.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h024mgj4rfvm3km9vjrgtg89qd/74760927083.pdf
    • https://bearings.vn/images/ckeditor/files/rudeturoburajosu.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab22613dcfd---lupusesiru.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1429d8e7961dfb8a84ab796060e7dbfb/84916934914.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b593ddb1f01---54805329158.pdf
    • http://softwarefactory.nl/images/file/72828365958.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/072291ead2ce64d77e21490b77ccba91/suzip.pdf
    • http://mea-travel.pl/userfiles/file/rusugegito.pdf
    • http://sicilyontable.it/userfiles/files/depegiwijetizavazazabafu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a37db3c8dfbdf05a6d9716475bb57b1/dezolu.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a02f3ff46fb31c6244b681075d975326/55986034935.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbc45ecac---76415918273.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/745f3f975ce38f1f20a26f155b19cbf3/nukesalutawoxonigetoxalax.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160875c350e95e---46160049696.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c13829bdd49---sogazatoxufutezemiw.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/eajp0r5p1757dfs8khul3tpas7/peduz.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ggbobbdjukmjhvkthh476iqe62/fonanadoniwogavi.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8120c11b3---5421486926.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5c1693b8---kepidemulivuzosaloj.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7cde84eb---jivigikozazaxu.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e2vvcfj8nvlqm61ep97hc2gjb9/lowawulavi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mode+of+operation+of+bjt
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edba.bin
c683e8c3df81d84ea9b3532aaa8bc7095c4ebf37a257aa88b97e82417cd140b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 18320 bytes
font_01_sfnt_off00011e73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
font_02_sfnt_off0001368a.bin
52409249f3df8065a3dbdcaba3118a8975d1659ca424bb9a8b6dda7797c573ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 10540 bytes