Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda8fd4a47aa846f…

MALICIOUS

PDF

96.2 KB Created: 2021-08-21 03:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ae83fb969988fb49ee2ed33b150382e5 SHA-1: 6b035c81262208ea2713ee47a08e338762acc3a8 SHA-256: bda8fd4a47aa846f61ecbe3c38223efc1172db3bc9c627ea1af9de4017730b57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://catamma.ru/uplcv?utm_term=code.org+minecraft+voyage+aquatic+answers.
  • 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://catamma.ru/uplcv?utm_term=code.org+minecraft+voyage+aquatic+answers PDF link annotation
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/72676749a659bee468f117bec1096ffd/54282857666.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gqtmgpgt47qk6v7qf50hdknqgi/bovewumogimarorawikezixes.pdfIn PDF document text
    • http://enewind.com/pliki/file/74073299043.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/niuem70chct9k7orae5a9t26hc/naboko.pdfIn PDF document text
    • http://ave-france.com/pics/files/80614441702.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/66332569211.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8c56df9f---votepige.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/8174628539.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/26144520238.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvnp8h5llm489s227ao9gso040/889407021.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dt5ns9p10n19ioicen7cebd514/96445971118.pdfIn PDF document text
    • https://appfacile.it/file/zuwamisagojibafipumuvakar.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/fisaropumubax.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/zimovejari.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/vulatajopi.pdfIn PDF document text
    • https://digireg.lu/upload/pilikukigowem.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/21843633987.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f568b46094dbbf7510cc300bf9555a2b/24531350570.pdfIn PDF document text
    • http://wirheiraten.de/images/file/33028931128.pdfIn PDF document text
    • http://stisk.com/file/vikekitunujalemigerupoja.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/586709bd7786e107868802ea20084fc6/62130534337.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/490010263eae461f488825a4f6c9bd76/bigavixodonojakabapopuvak.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mrh0tp6e43lthckiimgr5a2p95/24282013930.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610e92e2cb500---bijabowuwudepa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8c17bd46a---67481339059.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001538b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1538B 18316 bytes
SHA-256: e413e2c06d0c5958da3410974272af64efe50354ab3de638d9cffa9523497c8e
font_00_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 17360 bytes
SHA-256: 73a19b8fd3de575f7d50eac1e8ba1fa153bfe50509732fd27e8affbb5d18bccf
font_01_sfnt_off00012111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 11384 bytes
SHA-256: fc32abc1199c3b6faa8a681ed82c367181df46f7529f9cbe822f7584b7eaa866
font_02_sfnt_off00013b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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