Malicious PDF — malware analysis report

Static analysis result for SHA-256 6323ea585d8aa0ad…

MALICIOUS

PDF

95.2 KB Created: 2021-07-06 12:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fae41cdf5a58cf59dffa20740a64fd83 SHA-1: 5ea6e4fdc211c99bf9c2dfcb234bbfbc41fcdaff SHA-256: 6323ea585d8aa0ad52a2c1cf23b096e4697611e76c33298368608811d98990f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document acting as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hysansam.com/fckeditor/userfiles/image/zuxugujixowuxed.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a02e2b6---86743224852.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65919395575.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/61679795154.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/basidaxezudumavagapi.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/mumivibadupogijopanudeza.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a37bfd9d1d4---ginukomo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae927dc1e2---47911410509.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/65f9caf61f091a2bc0794fb96748450e/vusonibiwanux.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6h998rn59hdtjt1pm8bo0l3gos/10514285293.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/87376148997.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76578550820.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/nogunigeninarebik.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/65ec4bef11e9a2cd64bffb0d6fe2883c/mawokaretamepodoxemoxub.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b340b741056---39839988226.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b791de5485---32210685948.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/78519330284.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a378691b1---27104043595.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/70934622082.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/21656735757.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106150352.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/linelo.pdfIn PDF document text
    • http://tfforming.ru/d/files/dodivopa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7d138426---zijejize.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160718764dacb6---mofufadopoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=there%27s+a+nightmare+on+my+streetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 10620 bytes
SHA-256: aa67e91e30d33e7c8a0f3c91484308c23ba38fa2fd792cf400342934f85c9458
font_02_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off0001407b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407B 17596 bytes
SHA-256: 45f9bb575a9532b4c3859b2497c265c7eb4fed62b24f4b43ebdac5e34b823afc