Malicious PDF — malware analysis report

Static analysis result for SHA-256 c991156ccf9645c1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 12:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b718f76ac50c4d7f8a99b2fdd8beaacb SHA-1: e91033b4eaf094b2990820ce757c6b717deb8228 SHA-256: c991156ccf9645c187bc9174430bbdfa4132b34ba296f9822e2e5e74ea4dee9e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing attempt. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/15068466186.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zosetejarenagiw.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/63345169603.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/kopexalil.pdfIn PDF document text
    • http://shesob.com/file/files/15554386368.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/60804223070.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b630550d2d---7199680239.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/latikinadarova.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n6g9648nis1992uum94vqctnvs/67895412718.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135322f83c60---60575693083.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/jexevude.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/famapivotopiminixuvi.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/xijetogarusapukiwukegujiw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c12f399ec---54153261172.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa368d71705639b9ff077234d731756b/pimopik.pdfIn PDF document text
    • http://contelex.it/userfiles/files/77973929564.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/69602494137.pdfIn PDF document text
    • http://blueyee.com/upload/file/190116341000.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/5646860143.pdfIn PDF document text
    • http://maihome.hu/admin1/file/remizimov.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/womekemapoxezazisiw.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/woredepagoxevumu.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/fujopemufitesemiluk.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/76192594794.pdfIn PDF document text
    • http://chemsdano.com/upload/files/fetako.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zerubunuluzedigamedawas.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/midadoxezumiranoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kodi+najbolji+addonPDF 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_off0000b519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB519 19288 bytes
SHA-256: a506737cb3e94878ff06b64d73ab6c75fbe0c02516766a94fa76a4bed3dc6198
font_01_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10004 bytes
SHA-256: 4b147f314d2b248209089e0025abddf24e2d187f35ae9cc69587092a1a204af9