Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c0aeadbda31d82…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 18:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55323071b8f7dd45697c6c8f904948a8 SHA-1: 6d1a8735a0dbd7ac5d0c9eb8f017f060ddc89e79 SHA-256: a3c0aeadbda31d82df6977ad1e109be999a084a0950a5b005a7ac97ecbb46d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=unable+to+download+apps+on+play+store PDF link annotation
    • https://dehayemek.net/upload/ckfinder/files/41929528971.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/38581129503.pdfIn PDF document text
    • http://art-ball.net/files/file/3932585590.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/91024816876.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/nivoxilefotejagetol.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/felotep.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/timemepasarabufimodoneki.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/11427098686.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/vowutobupatenogesax.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219931036299.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dfc401f590f7ad3a2f8955e2fef71591/51300234569.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/disamo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613186f1dc899---safafuxe.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/03era1c12c61fqt47vfr2pbpvn/57564355333.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142937d8afaf---36354845255.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131859444207---fopok.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/75333595923.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/66637209838.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/24145753880.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xowidofotebegas.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/katolet.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/muxufujopitirokozazija.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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 10640 bytes
SHA-256: f70898dddb7f445b2ac9f004029a4e04739a705d1eeb5cb8f62d02e73ebd0739
font_02_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 17480 bytes
SHA-256: 5593c73b4e8c9cfee562c824cd469732fac9c21d648f2fc566f5bbacd3e5d849

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