Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9def3ad511556a8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 04:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ab0a787d0d6404cc16470ec68b62e84 SHA-1: d2d97830618453c7091aced5ba3183da759f2038 SHA-256: e9def3ad511556a853c8d7cd057ce52b2867b319bac15c64d983226df4b0a324
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oiseau-bleu-morzine.com/userfiles/file/52580657715.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614693e0b96df---nuropot.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210916_062655.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/79972356986.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gazonikalikomaneme.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb4eea3bf---27632907971.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/79900358500.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/vivujiju.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/89380823318.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/foveguwepogafobem.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130e048acbec---nadetukisigetabubudetime.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/36483227756.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b044955934---1636952334.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/vitatewufejozexunipedufa.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/ravurimizuvogejexuder.pdfIn PDF document text
    • http://pactolous.hu/upload/file/81537171616.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/39266705935.pdfIn PDF document text
    • http://katela.net/userData/board/file/67203272471.pdfIn PDF document text
    • http://lgassociates.in/uploads/57981183860.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/xujuzobomona.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/kozezefovinip.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gowojasafit.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/49149899725.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/55209623473.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/sevanufapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=japanese+manga+free+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_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 17576 bytes
SHA-256: bbf2518e3e8c4044de701fd0dcb55fc8fa98ed7f5daed8ad3e2bf445cdd4ac96
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 10476 bytes
SHA-256: a2202323ce86cdbefb472df9e5c6619dfcfd7586804ef15dcb656ac448de58ba