Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39bce94a881acd9…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 13:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 191ac0f9dd7e5c903466d25bccaca19e SHA-1: ba46b164019708d68dd548898c029ebfa3b2132d SHA-256: b39bce94a881acd915728acf9323c7199a1e354f55fdb5ce72c68b2e6ff628cb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary URL, 'https://smidgel.ru/uplcv?utm_term=valid+credit+card+numbers+for+testing', indicates a potential lure for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://smidgel.ru/uplcv?utm_term=valid+credit+card+numbers+for+testing PDF link annotation
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3e5739240324dac2ae8c3a73b6381df6/30951427783.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zetuwutunog.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/verisalefatatulelu.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/wuvefosagan.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5835675a4c9b3ec529c772d60161ab0d/78477371351.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb840b2b5---2910906372.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f7bfb7dfd---bixigazuxejapelanuxi.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/buwowimuxogav.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/244d3022dad3338580e5749b523cbc47/8313115272.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/50587253821.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9ecdbe1e501aba4fdb2edd98c1279ed8/worigiwijaxisodolunux.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/wunafi.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/15324140858.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1hm3u7pbd4traiekkdccuv77er/95189309731.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/18332368235.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/82589281575.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7dc34a63cb1efbc9b83bdf8fb26de903/xedijidekakaf.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/juxeb.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/dalorizofoxigezapela.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/43960279117.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/detusuwugipopejidut.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/6490aad445465d4b0beb1052486fc5bb/96469558361.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/tejuridamu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4782a11feb---xuzokuragosa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7f3c454e---98776870546.pdfIn PDF document text
    • 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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 17456 bytes
SHA-256: ed09bd9aaff387e43a720d4aacf73d7023350a029a858ccc47119e81f724ddc2
font_01_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 11028 bytes
SHA-256: 0cc824b9245d7d80a5d0b8d6fa72c579854266fad2c265212affe46bbb10245b

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