Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe8a5b55c2470e5…

MALICIOUS

PDF

91.2 KB Created: 2021-06-30 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b3072a066c169759ab0a59d8da9b911 SHA-1: 944e549d4823e2a930e378b4867bc1a951728aa1 SHA-256: efe8a5b55c2470e51d005207ed3b2c480135ff5f61d034f47dbe9806d8ad9bbe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common techniques for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/60821254892.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210624045507.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/57aa579ee173db93217554d0a91ef7a2/nutadatepalavozeromo.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/5j7le56t3fbok42lo161bvf20d/31246634928.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/265615230cd276b4edf8d236d0d0d0d5/weniv.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/e136960a94e6fb1685101de08f645ea5/wesasa.pdf
    • http://autohondl.cz/userfiles/file/84448689986.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160847d63c257d---gurisepururaledavanib.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/1b1aaa75081f370caea24e9b45fc74e6/xakixebe.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/4k17n8mi7kr2p5jsfgklpeu8p1/4755302859.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/dbaba221e0dd721b6125adcfa959bba9/kirotadejukikofudebuvibu.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a9a07403---94329243061.pdf
    • https://alrukn.co/userfiles/files/tiradiwimime.pdf
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/ponusebodegawalix.pdf
    • https://bookatowncar.com/userfiles/file/24140979574.pdf
    • http://sro52.ru/uploads/files/zejolurafeduxegizu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3puo36rv36tip5vjhaj3e2sd46/fomakumugurizi.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/763f8c84d1dbe5d97e7c5489d75c2359/bopun.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4650e004c---7986679926.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/65106594152.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ad67bce6f---13934970286.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/ht811o2m8vk9h9u345dlah8c8s/sokisijetuzedamarulixi.pdf
    • http://mopron.ru/upload/files/masirenivopivawetenax.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/360fa4efea915689ba40e814562fa30e/76831172140.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc37f43532---muwus.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63321e2a6---befudurenelet.pdf
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/c1fe784eb8079338ca567021c0c90e2b/8235080518.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pain+in+calf+muscle+after+exercise
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103bd.bin
d55b11bd1bd5bb09b46fc04f1f5777c32c60d3c16f83925c86f8014c41425464
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 10580 bytes
font_01_sfnt_off00011bdd.bin
80dae3a6961994ce1553615c47b9d7f70993b46527fcb01b5b363b3500df5b0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDD 16756 bytes
font_02_sfnt_off0001472e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1472E 16792 bytes