Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cadf2ed4ce3b9e4…

MALICIOUS

PDF

89.4 KB Created: 2021-09-11 03:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88309ccf46e31f9df955d6b29aec623a SHA-1: 68fe4bfe5d3943efe77f5d564252b6c355b79a65 SHA-256: 2cadf2ed4ce3b9e4928004a99919e151c6e7ef127a14c16f81e35997744f7cc3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple unknown domains, many of which are hosted on compromised CMS upload storage. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inphilong.com/upload/files/lisuvidewuwepi.pdf In PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/bupisubil.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/80677431494.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/migemoxebe.pdfIn PDF document text
    • http://baoveantam.info/upload/files/52796535115.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/sijaxolonidogixapi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351344d2a44---11849997853.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/fopowudaguxoxonelolixiras.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/zaxogizawibadurejavexo.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/dafesukokawurixozimowuni.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/47731255044.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29c9bdb5f---limikupogazuzivuwedeted.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/97516783355.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/11159512626.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/11718073433.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/vidozula.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363a688ec7e---difibapuzonazovi.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vumulewakobet.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd588def3e---68259904526.pdfIn PDF document text
    • http://hainfelderteich.at/745576903.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/96298665986.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2ef1a0d0827c79f458306d2b9ecf42b3/91624080525.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ded53fc7cb445144755b6edd42d035c2/xesuw.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/82046651384.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/24403107703.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/11897291485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=programa+para+rastrear+celular+android+gratisPDF 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_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10960 bytes
SHA-256: 4fa671c4082bd053357295442b32d1662f06bfbff49dc6a8acb8924a137239b1
font_01_sfnt_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 19340 bytes
SHA-256: 5319703d49a4869a9267261f7dc431346f7c28c08671744372a2cbc2eeffbc5e
font_02_sfnt_off00013e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1