Malicious PDF — malware analysis report

Static analysis result for SHA-256 156cbf14ac0912bf…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 02:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d9b78cef4575ae99b41948a6ee0c9fd SHA-1: 1e66038ea3266bded1e23428982608dfd4948825 SHA-256: 156cbf14ac0912bf0d0aa09b8f8ce34ff831cc09998a77e283460daf36c2bc80
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=15+%C3%BCbungen+b1+l%C3%B6sungen+pdf PDF link annotation
    • http://taniaandjohn.com/clients/874109/File/bewivano.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4239c13fb616de2bbc659d6e4ad59d06/bivojomivowujexufuv.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/43426978064.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qa47ip55kek0gfrg3ii91rl884/lipomibatilonexukigipax.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/717125c1d86b6c7ad9c35237a1ba86e7/fajikuzufop.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/safofotofivilaxake.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/napogawonogapuk.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/zarutagul.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ee4f141e---66248571598.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/1742519620.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609295f4dce19---70855642050.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/im16dfa2bstc5td772vhubri7f/73893306938.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/mubumonipivowapudajofufe.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a7f7288362d19da6bd79c12c3c02984f/67241138353.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/lifideje.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5027756cae98ba8f122f2cdd737ab5f4/21100787739.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/54600136493.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a553cb9900341aafa3b20be9fb5b3a66/75780043984.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073aeb3a4904---37663925722.pdfIn PDF document text
    • http://sun-eko.eu/files/file/50868619482.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16099a57948eb1---12863430680.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/26356733453.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/88352638977.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 19404 bytes
SHA-256: d34537054fc55a324f2dfcc31862265ce990301bfad98c52d3a03dbcbffe4dd2
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10836 bytes
SHA-256: 2bd91b74258e7e29a360a9c90bbd30a596544c31ec1c8e2d2b54cfd62c48db0c
font_02_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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