Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88e61c774678ae2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 11:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb5c903b5573ad474892815f1efcd064 SHA-1: 317717b4762bae4f7ebdc9152d5e3be6921a9105 SHA-256: a88e61c774678ae2bb103170c144542c5f89fd086cb73d5f0ef259017f71f518
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://adikkeempat.com/contents//files/mazimitepekagaregiwawel.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/vofojutod.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/sezakusevuwezevutunuvi.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kemivojogumuvu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ffphp7h55mm16jeo8jek8cs15/65819190895.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5bee6813---13720791011.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/89532688730.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/94504910375.pdfIn PDF document text
    • http://fygl.net/uploads/file/130031084355.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/37820979858.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d26f5ee2d---24785090840.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/rijonos.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/73bdf4470f223801f28bb163f963c195/peverasiki.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16100e0447650a---lawuxojofapo.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/sikirezovapirifotibuz.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7f3798c0---dojusizigupefimuduz.pdfIn PDF document text
    • http://expresskaliski.info/file/lusogal.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/49211015942.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/lizitepo.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/gigirikebusixar.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8de6e6c75f44004c50ecbf9faee0a277/nupuxepetakuzibajexi.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/vusipuzagibanujipabower.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab99f6c6c73---50583290535.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/77156382770.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/lapasifopokixurelebi.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fa698a75e---domuxepoxirur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=macroeconomics+by+h+l+ahuja+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 17700 bytes
SHA-256: b6893f5fe9f33170e0d24fa3dc245649dc6b1a3af571d07ea68b2d3764bba346
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 11264 bytes
SHA-256: 11ebbc4a1e9e45d302e357dfaef0d8d16d9807f999a3a45757ccc192f529b1c5

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