Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8ea19884d7e03e…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 17:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f15cad7a317f54673ed6d22160313132 SHA-1: ba6ff986027a534b0ca4fcef8a1f5f86861c9af7 SHA-256: 9b8ea19884d7e03ea27e2f617aa0b158f85f6daacc4a7bbdf26843d304d2eb2f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The embedded URLs and link farm heuristics indicate a tactic of directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://tongdaidoanhnghiep.com/app/webroot/upload/files/90521145574.pdf In PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/691993328215daa502b9fafa5a35320c/30891517505.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad9e23f33---dawadav.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9a872a0c2---42644793187.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/32ce4f6deafcc16bb69427f2a34abe9c/rezifukobixuropawefevija.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c508a11a719---45878175273.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/1bmftl71bsduhmebjgk6tg73ob/ramixoluvilegerujenepaf.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8b50b9a6---60894591450.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5b0eb8797eee6793e31bd9dbad50d715/tizesuxufigolefirirajodox.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/fexilotefaxofosibe.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/42742975086.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/18432478680.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/u90q2nsmkjn1nef3u2obt2bf63/nekepadekevukefiru.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/93734554325.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d66a492561b8d238ee02bb8b14c0005e/27163553088.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4b5c34c8c3b4e35364eb9409fc898e4e/67899655332.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2ab31d29---42854219660.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aplfkl26s0j6jh6h56bek54ova/90569263045.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/12698198998.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/bimedum.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e00d4d3a8043b7f6bebeb5fd540d53ca/sitoletemero.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/788631aeef0e1be8a68af41e10b99ad2/kunalapagumef.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160badceee1f3f---zonopuzipaj.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b29f0f08---57598583202.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a5c9ab7b---masibujafonazajew.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/4306937954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=central+dogma+of+biology+pogil+protein+synthesisPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 11232 bytes
SHA-256: c598f775f6ce2d371efb4efbefa07631f361514c80da895a936aedd4a14c50bb
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 18552 bytes
SHA-256: 390a28112537e8a9a6af9150f98c9fad9430e79ccf05556306500341975574f4