Malicious PDF — malware analysis report

Static analysis result for SHA-256 439eceab26a30c81…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9926d86942bc3e6ab6798a1f6dcaf632 SHA-1: 4e951e2b68a40360d07607dc3c9865dc593a5773 SHA-256: 439eceab26a30c815ea1bab9a135286388c95088e2e839c71bca08143eb65dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=tribology+and+surface+engineering PDF link annotation
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0b544258c---juwozokodurimeditekun.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/padaketuvumusutigabivoxo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b4cefffb---8556669963.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3d44a37359b8254df821b9cfdc01e738/90199691692.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607260961f97d---61990976908.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u55sf421dk74dt56qq5qsu2c1h/22471917614.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa68f37a74---43395149233.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a2df1c2b89beea739aa394a980dbb129/7523693033.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/11446174502.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/tokijobasixofimer.pdfIn PDF document text
    • http://nfc.soo.jp/file/30330112687.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/22f004f1af6988ce89632842517b5744/foniraropil.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/23763456980.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589963ff73---18536153356.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/nufadozezelejonorujetirif.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/jiribezob.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/53295824174.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a88819db2dc---xarumugi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dbstcnkr4jiq2047qgoctnjtn6/77306301806.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53c44e6ae---wikefusimatasigun.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/23839794113.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105231624055291.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/jorutogaruti.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fac1c0665---1286992839.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_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 18028 bytes
SHA-256: 4ab7a1e6125ae760dfc6dfd811be152f21c8f1435204a04126ce40b5974bd9fd
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 10872 bytes
SHA-256: adad14df8462495a5834a636b5292a7f9c1a6e07ee93b3c734a643da0ca4453d