Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09987cc3ed00779…

MALICIOUS

PDF

121.4 KB Created: 2021-08-09 23:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0be717a4e50cbf9c9d063b04460833c1 SHA-1: 2f6087316b1b650bc0c8eba52716ddcbfd56a0c3 SHA-256: a09987cc3ed00779bb86f690e1e79bd8abe482471173910bd6c89925eeb21274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://smidgel.ru/uplcv?utm_term=how+to+raise+luck+in+grand+summoners PDF link annotation
    • http://colorfulmedia.de/fotki/fotki/file/77643124271.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/24665291627.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/levoradobujakuxalofosuded.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210810_EF1DAFCE9B5BF010.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076e09d541c2---81725334430.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sedivilenutafafatepomi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5413c38d6a6b27be67bafd397d23ba9a/32488313252.pdfIn PDF document text
    • http://ledins.lv/cms/file/bimizi.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/piveg.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/94855619049.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5c406901---72173214981.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/73142508993.pdfIn PDF document text
    • http://flirdining.com/uploads/files/potosapewatuxixewopimofi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a96b196d59bf0d1a705274e35afe8c9e/bemixegap.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/kibisa.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mafakuv.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e70746ea0f6---madepesefisodoxo.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/34844518224.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c7d36690277ea2d841342f2bffabf389/72202417561.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3a79ffb9b29c8b2f23ad82213816d03b/92222668565.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/vuxab.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccf5b4b0d---48600115119.pdfIn PDF document text
    • http://vejwun.cz/images/gawugokanenivap.pdfIn PDF document text
    • http://altinay-law.com/images/file/61606305867.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
font_00_sfnt_off00015f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off000174ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AC 18392 bytes
SHA-256: eeaad5482f4849164beaf797a2a98ced9ab1e53f1a534e8fd997d26af678856b
font_02_sfnt_off0001a552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD69 10980 bytes
SHA-256: f858d16fff93ddbf8207270dafcb44a345773a371414d859b3efddd6305f4601

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