Malicious PDF — malware analysis report

Static analysis result for SHA-256 734257f2717822c0…

MALICIOUS

PDF

85.1 KB Created: 2021-06-30 01:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d8b936f992f93e30bbe334e8e2f0593 SHA-1: 903e967ca8fa5537dfcfeb34cdf7f93cf0e6f636 SHA-256: 734257f2717822c02b29032ab8365622d20c69246483c0c2198abe3e720825ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hagepoorter.be/files/files/82445027798.pdf
    • https://vieclamhanoi247.com/upload/files/vufazaluxewolewoza.pdf
    • https://chuyennhakienvangvn.net/upload/files/70529975685.pdf
    • http://ziconiavip.com/uploadfck/file/46263066150.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607016f00af14---bekamojadat.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l13e1mmmqlac0idt8am9mj1vlj/sipexirenazekep.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ba20474b---falusenogelonevidozin.pdf
    • https://bbgpiti.com/userfiles/files/jatebupulu.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e8d16193940c07eca8172865db694669/93256706039.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9e3d0336afc90fc166de33abcd745d63/43133615432.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c817c1ef9b---23801154421.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/khj839iemua34s8k3fofacpuv1/bakifupi.pdf
    • http://auto-spec.ca/fck/file/sexovupomu.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ducc8ls9s686suhliqcjf4pa45/xevofudejep.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607682e66517e---vumimageku.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e27bbc1ce128a0752b263d03fa2a7b70/36615324792.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/dataxuvemowodufugaw.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607556d2a1292---77118324396.pdf
    • https://kalitelivideoizle.com/resimler/files/jovupobajat.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/50884584970.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ffef0e4e---62361789464.pdf
    • http://svatba-emi.com/uploads/pages/files/69891828622.pdf
    • http://amctop.com/board_data/editor_img/file/202106240502.pdf
    • http://qtjdb.com/UploadFile/2021/05/10/file/20210510_025741_148.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+baptism+of+fire
    • 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_off0000ea51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 16792 bytes
font_01_sfnt_off00010263.bin
67192f6161cef7db26447113cb3da7679ddc7fc83581c5645d7ff427f659f1ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 16924 bytes
font_02_sfnt_off00012e3a.bin
c26885a4886567c835229c6afaf406d27fbb0ee6c93c2aae58f81fb6ed3edc6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3A 10492 bytes