Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56c2dcd4aba5812…

MALICIOUS

PDF

83.6 KB Created: 2021-08-19 00:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 901465603309cc94f9baa17e13340b92 SHA-1: ca4f7986c3f795cf8b611ecc6e5a5bc3ff55aafd SHA-256: c56c2dcd4aba581277813fee075063d6d2d0ca346a33b4417d72f832cd906bc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable infrastructure. While no scripts were extracted, the structure and URL patterns suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7761b6d799---gozovud.pdf In PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/romonatutoletolexa.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/68055457150.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/nirazowofusovewitof.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/latevasuxoz.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785991780f1---dobonepupu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f82f1324f---votexokojigazarovomunamo.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/2638067939.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0a21c8de9cc319795390a99eda1dd92d/88562318762.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/58210350701.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/denepevarurote.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dd9e2414---63753356132.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/34145480138.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/39633042803.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072162de098b---59285796314.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1e62c19c6---27107177589.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/64957311987.pdfIn PDF document text
    • http://ebus.cn/up_file/file/36773155620.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/36149752283.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/ladateninowekigoxokode.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072546f7e4c3---39698939612.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/85da68985fbe6192cbfebc6483660454/14817935733.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c166ca0053---62723629064.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9b86bea7d70657457b9c71d064d32288/piwenojipubidatobav.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/7876621462.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/figazevobibetawesizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+to+eat+on+arbonne+7+day+cleansePDF 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_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 17468 bytes
SHA-256: 5c234b2fb6cf8b07091eabebb2ea875ae1932c905766f3364753d8a25d9ec902
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10672 bytes
SHA-256: 4159d100531ff96bbdd5331420e340b42abc2a9fe202862340936a474c7f701d

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