Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fbb662abe21bdc…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 11:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e43f24d6ba2ddb42af0163f75c4b7e4f SHA-1: 634dd962e05781dcb6a639bab456673aed1ec59b SHA-256: 73fbb662abe21bdc089b1a9c868bad36e9ae5a0e725bb76f11d8a928a604bb70
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its structure, containing an image that likely conceals a clickable action. It hosts a link farm pointing to numerous other PDF files, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archiw.bibliotekalesmierz.eu/img/upload/files/bukatimuvajowofulox.pdf In PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/jonokefabakezoru.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/43167961349.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d014802c01809301025566c68ff0f26/jikajo.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zuwanetefodekukobivuz.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/vumoboniwipulifike.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a439e6152e---mifonufokavusesojil.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/zidoviwavodufemirire.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/zuvebez.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/11048812617.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/kawubanetugazipumireko.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/givaso.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/49604155683.pdfIn PDF document text
    • http://flirdining.com/uploads/files/voxipipuxuwuroxag.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesenobuvegatefexoteto.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/66416167897.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/646k4lhrq12u6dl29jm2kfrq4n/89834382026.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/kezawebawerujidubukori.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/wirowafokefun.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/datakutuxuwosufizebibekar.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/nepusisusolaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mp3+video+downloader+for+androidPDF 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_off0000b01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01A 10544 bytes
SHA-256: 5ab232f6af1dca31bc072b1ea5a74ec34cef151a9ebaf3ed2e2da6656c44e72d
font_01_sfnt_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 14092 bytes
SHA-256: e4ea79d1649af5246839a339158068e5049b32f92d97ddf8557e1aeff5082981
font_02_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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