Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4c073c9124f54e…

MALICIOUS

PDF

85.2 KB Created: 2021-07-24 08:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd5861a90a5c1f9afbcfdb36049616a1 SHA-1: 4741ee2825cfe1839a91665a447bb6b756b8c6d9 SHA-256: 2e4c073c9124f54e978f756f4b56e5e9d60ce980011d5b67e735367c55c32eed
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oresteruggiero.com/userfiles/files/70560365599.pdf In PDF document text
    • http://simonide.org/userfiles/file/2008053796.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/71283531848.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-2/20210702101424207108.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2d4cc3607e6f187b5ef3b7f514992c31/15751665131.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/12d860049aa42ec78085d844213bd98c/vabedorozasojizisitaz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d77bee11---15258824347.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/pekopafekabudurabi.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/83264268999.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/enhats6jcb52e8q6n3g0dondg7/soribebovoporetaxejuzaxa.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/6385581264.pdfIn PDF document text
    • https://ka-base.no/images_content/file/bibinonexidanulalonufag.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0tufnat90fmlp065dng8fov5e2/pixofoz.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13474c4dcd---33210622735.pdfIn PDF document text
    • https://anfauglir.com/images/file/77169494633.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/mewanukujajojap.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/tuviridexogu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075353801858---38473660869.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6b4b48b81f5c592f476beaa0b9ea6dd5/wimajurasufazedife.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/94136994126.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/44cfb3344b7a6c7378e0aabf985daac7/97029007996.pdfIn PDF document text
    • https://asiajitu.com/contents//files/zegopakox.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/59256843954.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16073d2c8420e3---fozovix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=diferencias+y+semejanzas+entre+socialismo+y+comunismoPDF 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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 17476 bytes
SHA-256: 59912e238c126504d564dda012b4e859c3d77eb87b69e6234c11311faed96238
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10900 bytes
SHA-256: b98d5ad09d5e15302f1d4e1016a5e4c7f90e7a9e629ad2399c271ea586acab85

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