Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bb2a7bf2e9667c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-05 05:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 728e4392ea20d0dba074da196f629a82 SHA-1: 44241fa15cc5950181c6a1c630ee435f14ae0e00 SHA-256: c1bb2a7bf2e9667c7595912d36ad481f90f17a03d1015b38bb0d8e4920757be1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=performance+appraisal+survey+questionnaire+pdf PDF link annotation
    • http://gianniarnaudo.com/userfiles/files/68611329759.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c9383d3e522---67184858202.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/85890180628.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/27306530444.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4782d1f80---fetevo.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vamepupaxojevixelomajebut.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a805deb0ebcb382874d7265476b785f4/327226281.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lj4p39volprubl7l0k6195d284/35461151123.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/88632788814.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/46094719897.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/kabanebuwaxumirijinum.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608cb7dd68b62---31754222484.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/81035759824.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/27519419153.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528003350260408.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/u95khmie36258hvui26boc6q6a/jokoronubajat.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/18143078591.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/mifefawusajigowil.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a1c3cf86---towudajexim.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda84e61ae---suwetufofagajopadirato.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c1c574f2765042c830fe1e9621bbf34b/gaxojegikilenuwodine.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/72676719706.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/fitexeboratebepadom.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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 11208 bytes
SHA-256: cc0c7cd7e0462fe2c63f3e55d6a6b9a27e0b874f53928d8720ce7d6d10494fad
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 18364 bytes
SHA-256: c9be862e2ac530f2ce9e0048d8f4b0fb2ad2bfc65136b64ce767ef8bb88dba0f
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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