Malicious PDF — malware analysis report

Static analysis result for SHA-256 f542a227f41145ac…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 15:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42e22fce2dcfb68be0ccf917994f0160 SHA-1: 0a07e0cf48f5b47b6c71e6974165567c2586f127 SHA-256: f542a227f41145ac3fdf9a2140fe6a8f69342a26a37bfdf10620179e61fb17c8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. The SE_CALLBACK_LURE heuristic indicates it's designed to trick users into calling a phone number, likely for a scam. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or malware distribution attempt. The file's structure and embedded content are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kingbakerypans.com/userfiles/file/fufapud.pdf In PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/lafex.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bcc051334---vugebadizavenuru.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210904014550.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vexirudifizogixitosupepi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319df6e5449---veboputobopemibizoviminu.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/kijuroverawezinazavimat.pdfIn PDF document text
    • http://djpress.pl/Image/files/muxazonodolurut.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/64582217391.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/2526748089.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/basulesotilibegozivizi.pdfIn PDF document text
    • http://balalajka.nu/media/32587975230.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161417a69bcce5---kitapasikoguwumarefag.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864cc5e51c---jisog.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/kuliduvo.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/60949511369.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/kurotibofavaxibutinawerep.pdfIn PDF document text
    • http://ave-france.com/pics/files/wexasax.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/68396252921.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b2712c11---56850047965.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/6057226120.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/36890930376.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/kiwodavozepegub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=full+version+of+the+battle+cats+mod+apkPDF 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_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 11260 bytes
SHA-256: e43bb6eb1139625cc61dd31c29cc4ae6653682214752066f40fef6145d347301
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 17924 bytes
SHA-256: c78c4c95e768d13e36734c46f99dd2e00b47bb05b8afb800cdb658a736ea6f33
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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