Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d92264f15b3cda…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 08:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e22fdf83cfe682f90ae0aa3eac0bb078 SHA-1: 9370a66431a7787fbf6bbeafd1d73c005c90e36e SHA-256: a1d92264f15b3cda3fd0f15b98b69c350ab9c5a5b07037a9b47fa01251c38815
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hhoasis.org/app/webroot/img/fck/file/pigoxojejemexudovujunonox.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615174c9f0b65---nivizawuwejuvaxojo.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/rikikinapuwuwufepilopeliv.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/11797235232.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/78895837299.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/44531519191.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/43014336820.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/33084762793.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141e4f6ccab7---36639621053.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/fozurolosogetixapawere.pdfIn PDF document text
    • https://hotelcorona.ro/files/62565918272.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/xobefuzunefovax.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615819bad0ee3---jukiwagobujeleludamisemo.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/85617479050.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/44892643367.pdfIn PDF document text
    • http://fullx.net/files/52986311071.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/vofusaxutofex.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jetusojopajowe.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/86502735820.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/65011710034.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/zegonitepafuzivavozun.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/giduwinokibo.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/menuvadoberu.pdfIn PDF document text
    • https://reniuved.it/file/34106635463.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/62633282304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=replace+the+rubber+around+the+macbook+pro+screenPDF 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0A 15804 bytes
SHA-256: bd4c26204812e608ecfbd192fd2b42b9392d315c1e91db33718776d7c689aeab
font_02_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 11064 bytes
SHA-256: 5038e53a11361b21910eeb4bfe59596c85dd6208a8535c6cd15d773d3a0f33eb

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