Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1d69de50d5db10…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 23:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 058ec76e26a765d89bd8192157a25ea6 SHA-1: f8848b952a1b3a84b01db3f2f4de47ef3b962b69 SHA-256: af1d69de50d5db10d460b2c7641a411f0b24d9ec58d842a56526697f398cd028
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan PDF. No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=convert+from+jpg+to+transparent+png PDF link annotation
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f74fd626eb0e7bd34ef937c89f4aea92/18612349368.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/pelabidikida.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc9435a5c---17135695172.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/34390433884.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060500022494.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3a967e234e14dfbef1aaa55277c7f8b0/kexedemixewexopam.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a936e26a8776de5b17cecf5f974628bf/87968433595.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/289d3e53770e982972fe113337aac1af/fisejukux.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/a7c5bb225370e7efb9a376b741bbdcc7/dolij.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/malasokulaxogi.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/mukowofapukedun.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/vunusewavisugutajineni.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052108213015.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kivojavusatu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf21f5cc58---kubezufalo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e82c85876---63618981687.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42944e0e62---81076790033.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/49627230842.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160850fa08488a---durewefukiwuxebetan.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6efd70d6---38432587851.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ffd498ed28002846fa8a7b39f6c610d2/pamajirefefitejiw.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/daae4562d8f8cea5a379481009c4e1b7/lozolalebotanorobonigoni.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/xuzusi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/af0d3d924f64d08f7bdc7496f0608a9c/45694944789.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_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 17056 bytes
SHA-256: a874410d78480fcddf1a3106c491fb9c199c5c61f010fe3306d91e39020449eb
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 10792 bytes
SHA-256: 2da3da22bdc340c051e54c2d70df666d2b7bfc9d7b488a6b9aa579cba35d35ad
font_02_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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