Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a43d2f73cd26c8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 11:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98deeb0e664141ba579651bb5286704b SHA-1: e01bbcbd11d1835755a7f60c9dd70c93bb6095a3 SHA-256: d8a43d2f73cd26c878c3c854e28a84481496992aad279943899ad617cb7e8a6f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or exploit delivery mechanism. The presence of a fake CAPTCHA heuristic suggests an attempt to deceive the user into interacting with the document, potentially triggering an exploit or leading them to a malicious URL. Several URLs point to PDF files hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://aesg2edcv.handylover.com/upload/files/49895927906.pdf In PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210901215641.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/5156280865.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/20091732203.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/94588846194.pdfIn PDF document text
    • https://2acontractor.it/images/file/lidapiwi.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/44632884072.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/45042437990.pdfIn PDF document text
    • https://davnosti.ru/upload/63935408160.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/xazegofofijupadid.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xasatesipirutasose.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zosugaxu.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/lemokogerefar.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/jexaviwipesidubudopigop.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a4177e04---53808828357.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/67294460544.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8477br7nk38es7jgia04o29lt6/10596369880.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/44d2ca52869a5b57062110b3c6343c75/33455991317.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/4459113722.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/zajigejivi.pdfIn PDF document text
    • http://chipgene.com/image/files/20210905_020100.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642b1cee20---xamejepumigudelupaxe.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/80611553560.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/80619980322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=call+me+emperor+hack+mod+apkPDF 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_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 10440 bytes
SHA-256: b2ac5929ee9cf34177b90c4e7ed8b59bb250bee89c21d99fe74c3600748b7b05
font_01_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 18404 bytes
SHA-256: ce2e15246c047dc8dcb263fdde11f4089bee7c28faec061cd7b394b42c4ae8e3
font_02_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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