Malicious PDF — malware analysis report

Static analysis result for SHA-256 228d66eb44b31607…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 00:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2f7d63af203ec24c8cec594fcbb0ee7c SHA-1: e278f160f989fbd4b6a1102ff7d65572f36e2a30 SHA-256: 228d66eb44b31607df7d71b35599eee75d0a641965b1df68ed01dcb06fc51da0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=mod+apk+dr+driving+4 PDF link annotation
    • https://boucherienabli.com/uploads/FCK_files/file/namozujusedeboseba.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/kevivegukonetepekeduroz.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/66141945273.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/suvajalozibujike.pdfIn PDF document text
    • https://ibextrail.com/editor-images/wuwetogojusurub.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161347d48b55fd---24798781005.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/sixosonoxisavefuf.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/99898561629.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zibolume.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/dimomekijopo.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/80550361153.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/kopalasukadolusenagez.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c1b106a8---pizupopepubukular.pdfIn PDF document text
    • https://aneri12.eu/res/file/ditekimakeperajulu.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109110502095363.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/99647373365.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2a3b2f76978020375443f71b71b92069/faxugaponedusaxomiz.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///23379052095.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/96090548769.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/31276415549.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/kepuzunidelidozapaxumuxed.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/daxoniseviketanod.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/38237050471.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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 18764 bytes
SHA-256: 1b3ea271a1162a8b62a0d64106ee682b66307ac3cbaec8db9e3009a7558e0764
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 10352 bytes
SHA-256: ef41189bde0c7c3a1601acad99ea753bcdf95f04f31c46fcb5672beb02984e39