Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3b95034dcd9034…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 21:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9db94f6e874743c82caf3b8940ce355c SHA-1: 0455da30e22a578772fd872f7fb4175f73da2874 SHA-256: 3d3b95034dcd903472bdb3b3989e6b67519c6fdf194b790dd039df9269caad94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified the file as malicious. While no scripts were extracted, the structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/81qrash4s4pqldq4dap53vtsa2/51776661273.pdf In PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/49785669617.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wadelixofojowowixase.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/giweloguga.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/fagonagotejimo.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/52612436543.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/75018165623.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/47713245583.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/70873772857.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9bc44cbe69dca81e27708204a07930d/80286679529.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r6t80vdnntd52oa0sl63vbqogc/98687585481.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/42142004828.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feffb9231e9---xajajexajupebavuwizunijez.pdfIn PDF document text
    • http://belloverde.net/emailer/file/14429995738.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210719093517_ftzv61.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/52b5976f040cee3dd55aae94fd752795/tafafokugenudakanolem.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/078e64451ea364c51c5de946298a5ad7/30244353176.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/mufabivafamekevamawa.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/laropibevatirofobiv.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b509ced8f---wamupobevupatolokenoburul.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/42046842625.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fb264ce09---tojuwupipuzujavew.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/kanesuzakejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=charles+bukowski+sull%27amore+pdfPDF 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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 18272 bytes
SHA-256: e283bdff67e38535f077f6834279787b1e64888b6862e3c914f76481e546f75c
font_02_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 11044 bytes
SHA-256: d1f1fbd1b3cf43388f6b2a29edf21b633db104c7000944a74b8a98be94424159

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