Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5c8a805b1d0d75…

MALICIOUS

PDF

88.0 KB Created: 2021-10-05 09:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0efb27e66c07cb49ed746fbf1b552b37 SHA-1: a3b20536af1ec11075528b36df31a6b725a6075a SHA-256: 7e5c8a805b1d0d7585b87c4002732981cb4fb37bf8e36629cc11780f19174d4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, embedding numerous URLs that point to potentially compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=classic+baked+mac+and+cheese PDF link annotation
    • https://konyaalotaksi.com/userfiles/file/bejififigilujedaludusip.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/50767705667.pdfIn PDF document text
    • https://krossi.ru/images/content/files/7036900905.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/59240821172.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210910_8825762CEC67ECC3.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/dolirapufewukuxo.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/nemomovedobareteri.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/57365532796.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b9ee204e---nisidozapenas.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/kusimijopuji.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qhrl43s41btsfe725enll9roqf/tisuxofilofu.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/kosuwofazeru.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a25cca35836e97a4baa1e21b72eb75a/kiveguguban.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f627c71036---76095613700.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9bc2c06d0---14465346283.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/27822782126.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021928_41820_368.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316aea6a3dc---98122750414.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/kulofimoxonezo.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/58096849943.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/98282648072.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vawosupawiwuduvovosin.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/roxugiwuv.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/tiratawesegisatowu.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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10580 bytes
SHA-256: 54ce38c5b3f35ea411c411cb30efaac7af4aa346f28520dce9b2c27d1a2f727c
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 19744 bytes
SHA-256: e948989dc5d9eba6775f1f18f861fa0e7ca790f5d3f565db26bf2773aad7d579

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