Malicious PDF — malware analysis report

Static analysis result for SHA-256 5291564ef2fd8322…

MALICIOUS

PDF

89.3 KB Created: 2021-09-22 17:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 547e3e30776a66a8e2e9a4545a5d184b SHA-1: 516945a0f861bc753d3227c67e93074d004c4742 SHA-256: 5291564ef2fd8322d1d15565368b8fed74f1808803adacd7df1afb4b028eb3b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised websites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=play+bloxburg+free', are designed to trick users into visiting potentially harmful sites. The document structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://archism.ru/uplcv?utm_term=play+bloxburg+free PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/63e9002cae56ec2d9477f1c22cc9a1f6/92625500533.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/zefafibev.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/kujuxifulokifunekuluk.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rovibuge.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/bebokitaduperugonolo.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/94982282433.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uj2d4f75nrlmssqrac2on39rvt/guzizemabegek.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/98219315902.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394ba875f97---gudekagugubadabobetegego.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/juwadezudo.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/melugewunarotun.pdfIn PDF document text
    • http://boldogelet.hu/media/gunosemefofaboradivawa.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/tuseminular.pdfIn PDF document text
    • https://ntc-container.com/upload/files/nejizikonafowaxefid.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vinipoluxejeperidiwipi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142599bc3b4d---25920119982.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///witunojubezol.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hsd5orso3do5g2cjpct3avk6md/43955957135.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jufesegugoronoref.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/novipozip.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6dffb209083dc57addf9f26d0dfcb381/webowukev.pdfIn PDF document text
    • http://rafaelokazakov.com/file/peguwokexipisadujoluz.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/pudaxu.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/76725630819.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f5ee31de2---8581925971.pdfIn PDF document text
    • https://bep.semmelweis.hu/userfiles/file/3338932859.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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 18716 bytes
SHA-256: 63cd54bc9597aeea4a0e0491e5d50e87596cc06999daf80caaefc103a31d5d68
font_01_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCA 10384 bytes
SHA-256: 0e9a8a8558e15161cfb611da312242a4dacb17bf5a0f0741b292ddd9be7cbb5b

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