Malicious PDF — malware analysis report

Static analysis result for SHA-256 7777e8686cb4c15f…

MALICIOUS

PDF

103.2 KB Created: 2021-06-30 09:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6cf18642f9de8c69202ebe38e49b9b3 SHA-1: 4a8bf834bb8fb3fd08be922f9c4bec07c88992fc SHA-256: 7777e8686cb4c15fb0f502802db729879958d157b4bf102714b97fd6a78e79ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://czdashan.cn/uploadfile/file/2021050602551673499.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/21d53324d72a3942b905f56040155c8c/nifamupifubaz.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718ed0c394---jerupu.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3qcv1299hgtjc21cgvcqil77s4/49115133467.pdf
    • http://aliglobshop.com/userfiles/file/varugav.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e68932da---vopazix.pdf
    • https://canionglobal.com/FCKeditor/file/66510643361.pdf
    • https://oversaslogistica.it/file/wapokuxeduwasanat.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/62stuvleve4tjrqem9h60e0f9b/9493939.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc956e515e---31640919582.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f5c4667ff75a5c8eac3a5ae4026a500e/62490890355.pdf
    • https://associazionedynamica.it/uploads/file/xaragil.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/piofjcf499svoe7mb4ef4hv8lg/sexoj.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b082d19048a---luwevezowurilu.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2301e9a6---1699165585.pdf
    • http://hondatayho.top/img-ngocbao/files/zupozazutuxetovemapib.pdf
    • http://grandrosso.com/js/upload/files/32892889345.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/v56lj6an7iltac5iqcojjboufi/gilovaposexugasetewasofud.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d825b6683a---6782678180.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4b2bc4ac---gesupobatedo.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2867d51aee---21029711432.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qpsopv63d2bul31ntsvaefbgf8/24852942376.pdf
    • http://solamsys.com/userData/board/file/38392387380.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8159f47bfc---33433011883.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/fr6ef4djapt92ovc63poj7hh14/2942194370.pdf
    • http://teranor.com/ckfinder/userfiles/files/sazedun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=galleon+in+a+sentence
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015645.bin
9133f4c77a73ee10101591e93c04a41697109377b54a89c3c6002a4c056dd6ef
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15645 18552 bytes
font_00_sfnt_off0000fa6b.bin
e9f9c9414b4d779c86f11cc63dfb67d9fa9983ae66e01e6153942a2beb2a8b5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 22472 bytes
font_01_sfnt_off000131ee.bin
ec40d40dda42929a6a36417638ac979dde2c7aa7855f307c92fa047939f15953
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 10164 bytes
font_02_sfnt_off000148cb.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x148CB 3464 bytes
font_04_sfnt_off000174af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x174AF 16792 bytes