Malicious PDF — malware analysis report

Static analysis result for SHA-256 483f5b4066062920…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 01:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 822e57e9a33872f6cdc5f2715ef5f711 SHA-1: f1c376149937ed2e3a24b23f60096a48abcfa53a SHA-256: 483f5b4066062920b611c280146617eed073f6b6bd05786bbe1e2858e2d46035
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=mazhaneer+thullikal+mp3+download PDF link annotation
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0a9608e14ae66e58112ffef90ab7a8bc/42883139696.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/67900453906.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/pupeduxemonuduwogasale.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/petirafes.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zedibag.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135818848c52---rifuxenexulubegitobol.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/vezafogoma.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dipewizabu.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/93047953701.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141121229cd2---gawenuruforot.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109071844331546.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/foxutiseraxixe.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/wopezexatixe.pdfIn PDF document text
    • https://computerzone.pk/file/gajakozosetefexobisokis.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210906160158.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109020936481719.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/12681164707.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mitomod.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/21766618877.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/24538783400.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/2255548381.pdfIn PDF document text
    • https://armenia4d.com/contents/files/31785610944.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1c147c8df7016b8a18d0879ba31cf13/63850688865.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/vikifo.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/44472158445.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zutugoxumebebapasisefoli.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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 17352 bytes
SHA-256: 8c907ab77b1957bca6670a7722ee565e6d078ace8e1717dd9bdb8791d3bfd75b
font_01_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 10992 bytes
SHA-256: d5bb64968425d8f4ebc766672bb4be2a54a7b01f808e80013f854f3994a91080
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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