Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a97fb4c49e850dc…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 21:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fbc3420c80ada585f003d909120ae0f1 SHA-1: 18c383a4417ebfa45f224d53868d9c3f67c246d1 SHA-256: 3a97fb4c49e850dc8ffeb693aff5db4442b70c9c98492e720567bdbec452f9fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=bardo+thodol+espa%C3%B1ol+pdf PDF link annotation
    • https://cuacuonbentre.com/upload/files/98664783478.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c52ded9e3c910dcf0ac684b12d16a3ba/72724833586.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/nomujovufexovibob.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160855472eb88f---19314777063.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/5643935776.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc11e18ce1---buwagegakizuzomoli.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/u13r912gt06noe30299k0ji8n2/17382326721.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/desufemafatotilijotixuxe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f2daf7d517d184a169921a283c0454d9/jalebat.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/90400142136.pdfIn PDF document text
    • https://yellowstonewildlife.com/nivudolulatet.pdfIn PDF document text
    • http://muszempilla.com/files/file/64150422985.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/28811640584.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d02aa5a47---56294593907.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/50264957821.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/85v7gf60i9knrboua1ngbvp39k/73553325946.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/kanuwake.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/61ef5eed4487804675856d288f9c1d18/92056166381.pdfIn PDF document text
    • https://tempegaring.com/contents//files/34017814407.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a126b348a---vagisujuxijevivewiwu.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/votibidamitelijameb.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_off0000c1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A8 19620 bytes
SHA-256: d32e7405fb2cbc544e1251e3749f5b1b52c93bd666e1b35f7fdbf276feffdbeb
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 10656 bytes
SHA-256: 063bfecb587f9244f176c13df569bc789799f755df5d931f3159fddb39b3758b

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