Malicious PDF — malware analysis report

Static analysis result for SHA-256 05caa1a1e42c0d82…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 10:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57ca87b27977e188aeee9ffee829dcaf SHA-1: 67b3eaf2223a5450fbdc5f26c7c0de6df41d8289 SHA-256: 05caa1a1e42c0d827bd837bad65e7dc48079cf89ceada33f7bab0df5723d38d6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics identified the PDF as a link farm pointing to compromised CMS uploads and disposable hosting domains. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://chinawin-consult.com/userfiles/bubeziviw.pdf In PDF document text
    • http://unesco-mediain.cz/fckfiles/file/niwazenonepa.pdfIn PDF document text
    • https://laser123.com/geektic/files/83793322102.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/41998536462.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146553c4f3a7---91715262315.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/jagiwajonalitoxanokanuk.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/nivekirajabozub.pdfIn PDF document text
    • http://becucci.it/userfiles/files/vokuko.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/xujavelepoj.pdfIn PDF document text
    • http://nensi.si/upload/file/37677390780.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0abfbb5f994271d86ac48baecee41b43/giripawolunor.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/96295165124.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/58981014967.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109012205476273.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80773287428.pdfIn PDF document text
    • http://atrsara.ir/resource/files/fokusejiporusoz.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/lepakukazosada.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/tepakorutaronuto.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/8778187128.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b42c47eaf---mavodelurinatulodib.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/maraduwijolanuvotopu.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wesenevalubunalek.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/wajugowivatijowarubuku.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/fokozupegadizozabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=find+the+lcm+and+hcf+of+6+and+20+by+the+prime+factorization+methodPDF 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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 15256 bytes
SHA-256: 431af9daa18f9ddb865636b151273d47e7268195741b6d1d4fa516a20b632acf
font_02_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 11416 bytes
SHA-256: 7c8f77b5ae62b10f65b08fbf916118c941b42a01dcac5bc72a1adc57c9b85c06

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