Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68267833413ffb8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 03:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c3fbdfa2fb5007529cfe52f75413d8e SHA-1: 6cf621a51d8a8b4fb0e4c44ddb1a5dac729be8e7 SHA-256: b68267833413ffb83a17cfb530f5339bf85575db8ccf0cd9e5d8217623bd1f54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://synerhu.ru/uplcv?utm_term=wow+sports+live+apk+2020 PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338bfb078a4---zefeji.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/xiwufixatavo.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/58865025172.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8fd9d9961---62270059060.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/76368024027.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/57467038168.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109091702525759.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/losarexofalowotonovipafi.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/91673412425.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/lomadizotipexuzatoza.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/14225983710.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/35882902349.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133facb35af5---84276514468.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/26258985853.pdfIn PDF document text
    • https://cartolmania.it/file/kevogesas.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/lemug.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/sepajop.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/kavipinirapovode.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/fitipojatasodufujedimav.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/leloxudogisuxutipo.pdfIn PDF document text
    • http://epicridesnepal.com/files/24165774530.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/80950949137.pdfIn PDF document text
    • https://codecs.ro/images/file/96486243764.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/10567635232.pdfIn PDF document text
    • 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_off0000b21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 16900 bytes
SHA-256: d809e31313d6cf8db178382b75a4a456b90bfa376923bce9953793209e02f0bc
font_01_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10620 bytes
SHA-256: e5fe50e3db207401d503b28d22106eed6d7530d635c71caed1bd54b2518fe09d

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