Malicious PDF — malware analysis report

Static analysis result for SHA-256 77de81ad40c545bd…

MALICIOUS

PDF

92.5 KB Created: 2021-08-30 09:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 90bb33351ddc191bb49d5642e58dcff2 SHA-1: ad78b5fb80ecbf07cfcc55c3508b5c5abf0571c2 SHA-256: 77de81ad40c545bdc3e80e4d083ddf285d4918a5abe9489f1ada024a6963a8c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://es21sys.com/userfiles/file/72863563805.pdf In PDF document text
    • http://mamtomchabahai.com/uploads/files/files/xekibuto.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5ed9a72d693a4f899a20c4e5cb4f0dd4/12253459656.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/korejopubit.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/73293999339.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/gaduranofadadupekube.pdfIn PDF document text
    • http://rooptex.com/uploads/26635391208.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/75986106253.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a783cf4f8---84410391969.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/10029516588.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/99948931425.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ce8e8c9dbb14bab4ece0b1e2783e6777/pakanolo.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/21975784922.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/viratenukaligutir.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/32360106252.pdfIn PDF document text
    • http://staropolski.net/Upload/file/gedinapatirexibivikuj.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc098b61ec---rolekezomodifukujejafel.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/watojal.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b467cfad5cc---jivibarabefifonetipip.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aece9a4265---zozibogojodajuben.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/warewibuwuxifitugejage.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/xenofanudepuduzi.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zefinavogul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+making+of+a+poem+pdfPDF 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_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 17728 bytes
SHA-256: 0aecd97ac3c9aeceaf11277f936edef8f1a560499ace1f7ad2b0dd0feabf65f1
font_01_sfnt_off0001337c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B93 10588 bytes
SHA-256: 1eedd158c4c5d591437718ffb0640193cd6cf1e83ad52e43a6f982e65baee455

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