Malicious PDF — malware analysis report

Static analysis result for SHA-256 d310413cae83cd4e…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 20:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3819ad3cb63a0a79b32224bbb4e7a74f SHA-1: a8918569d7d5d8ccf24252e93b0e00f1d932b47b SHA-256: d310413cae83cd4e6d1e2dfab2a5ed6ad5463c48c407d85f590a3c1184305aaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a link farm pointing to numerous domains, many of which appear to be disposable or compromised CMS uploads, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://muzeumostrowiec.pl/obrazy/file/50003004035.pdf
    • http://sllight.ru/design/img/upload/file/tasedisawifofulojunino.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9263dce4f---ledugiw.pdf
    • http://pressvaluation.net/userfiles/file/27716031877.pdf
    • https://zemiigori.com/uploads/file/sumezegenovoravefi.pdf
    • http://moestuinwebshop.nl/userfiles/file/nivupig.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87ecb4818---nerokumumera.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/56d323a5c6744be9c88777e6f09675dd/fimuxu.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2c298f43bfff8545c06aeb7bfe07a638/82772212846.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2lltaqjvufkpv225hdkhj7jtfj/6787238616.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bc8f04efae5f3651d2d8cc0f715a2866/gilazife.pdf
    • https://bczenekar.hu/files/file/sisumazo.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1170065973609fa796d0c7c.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805f7dce29a---85549562596.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a0d7a05a---26469431365.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/df7ff6a8fe909e38a25a1e6971dd54ab/59578732578.pdf
    • https://xistenze.com/files/files/gulurasetin.pdf
    • https://dakhoathienhoa.net/images/files/baribiragunisipebim.pdf
    • https://soechi.id/userfiles/file/28873387985.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b327deff2d---50255505756.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/10nocii04e6j9m3um4h4hnb811/74353204711.pdf
    • http://wanyuantemple.tw/userfiles/file/dujaxoxipujumabiz.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/10cd5637bdde7d7d2301fdb5d6892639/57210314026.pdf
    • http://skybuildinfraprojects.com/uploads/16561055008.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hddplmndo340mvu6tiqb9kr6t7/winotawukimawen.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fa810863d2234f4fa947d90a6d90e430/2463233542.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=user+stories+in+testing
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb2.bin
3b5ee0fdc43d3bdb2da249a1700fd890b84ead29f2fa7de99e1330fe1615a22a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10080 bytes
font_01_sfnt_off00010547.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 16792 bytes
font_02_sfnt_off00011d59.bin
553789fe61dbcc09a7121d8bf564cd196bcf2ea62cbb392d6fdc4edc80cc94f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 17304 bytes