Malicious PDF — malware analysis report

Static analysis result for SHA-256 31be8a6038cfa5bf…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 13:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ed7c121f5ae7f38080e3ac459f100c5 SHA-1: 059f188d4465e40a5c0ee30562fcbbe5280ca88b SHA-256: 31be8a6038cfa5bf61c29a4898ae89ee950d6812e3177c1696dcabbd040879e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the PDF and its URL distribution aligns with techniques used to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/51845823567.pdf In PDF document text
    • http://asupuro.com/upload/save_image/files/21479793697.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/gotebidofidabawazutus.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac9a3c1c6---44330805530.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19db2f21e---xizazitumezesizolarobuwi.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pexubuwivaded.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ea5218ce6089f88147fc3f504c7f4e5e/vivibazowusedo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4afc90b4fd---59101852204.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7a0f07d3---93165957766.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/nuragaridekan.pdfIn PDF document text
    • http://synowka.pl/galeria/file/62812826678.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/62048102250.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f105c43a7f---palimipawutasavorojubexo.pdfIn PDF document text
    • http://teresachild.com/upload/files/96427516792.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160906bbbce390---16436641836.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/44656456102.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f508bbab28---vazerubenupatasin.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/47295965463.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zutetizefivepedadejoje.pdfIn PDF document text
    • http://artside.org/data/temp/file/77741167583.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612a15590d3ed---wetawegivikunabenike.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/popifukapabanofosenirejo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd6b60f477---15701633975.pdfIn PDF document text
    • http://nature-revive.org/files/file/kozarafodojusisojujew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=centerless+grinding+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 24976 bytes
SHA-256: 3168a9e15629236ead2fc96b5b336298ff03aace2642e13944644336b523a72e
font_01_sfnt_off00012acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 10424 bytes
SHA-256: fb0a35695eb67f420cd3dcc832dfc886c8d0e587cbaf686b14531d1195427b70
font_03_sfnt_off00014a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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