Malicious PDF — malware analysis report

Static analysis result for SHA-256 b771659f6f695ccb…

MALICIOUS

PDF

94.3 KB Created: 2021-07-31 11:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f8513ee44867e8f37c6dcc07f3dc1fd SHA-1: ea6e517183902b795f36c76754a2f2aba7af4fcf SHA-256: b771659f6f695ccb7c9a7f2cf42ae1433b50bfd4333e39c36d65333e73fe92da
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting, which is a common tactic for phishing or distributing further malware. The presence of numerous embedded URLs, many pointing to WordPress upload directories, strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=going+deep+with+plate+tectonics+study+guide+and+practice+worksheet+answers PDF link annotation
    • http://codienlanhminhquang.com/upload/files/zejakowerutizurisuxurokok.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af1359714a9.pdfIn PDF document text
    • http://aimic.com/userfiles/file/46988971961.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gatesul.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/33592787628.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98862958076.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/41782867950.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8feb54660---55775237194.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853e03019ac---52197414283.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075010386288---60042163350.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/7ad590a31465a7cf36c8d981e6b556c0/39754652243.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/6947203584.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/67286506814.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1bd6c1c186e57a463bd60f60dd817aa0/zevasimomixusava.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/sefeveli.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/49606618993.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/wozorezetomakabupetusos.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6f126721c52c5995a0a7954972c7e10a/93340627972.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/zuzuguropunorezilosuvak.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095be5531f5b---tiwekeropafidokawe.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106080902305674.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_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 16628 bytes
SHA-256: e3c5b404cf60c603414a1846c52b1ebdbc70285bb2006749f9f4188b0f03a83b
font_01_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 11224 bytes
SHA-256: 3ce7b08bd3200e97a13470eb02eeea7cf06f53b56475a0947fc214b806ab8030
font_02_sfnt_off00014f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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