Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8f2dd814e5c3d7…

MALICIOUS

PDF

103.6 KB Created: 2021-10-28 01:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1558c28efec9912d009a7bea875fb84b SHA-1: 4dfba5722538cb21e101c25d176fe6af6396acf5 SHA-256: ed8f2dd814e5c3d795cd3d7a36f56cce4fd6525266f99252896cdd876d62b0e8
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 are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=how+to+write+in+pdf+on+ipad PDF link annotation
    • http://lblussana.it/images/file/34981829767.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_57A7852CF2584B55.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/27654907620.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/3041506443.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/disero.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210911_103459.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/21487220467.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/koxegeluwawozezazeduzi.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/pokopafamiv.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/40880772969.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/38799205816.pdfIn PDF document text
    • http://parafiasadkowice.pl/pliki/62374492519.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/wewipowuxuke.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615e2a57e52ca---xaxowubog.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/51049663916.pdfIn PDF document text
    • http://risme.vn/files/52527870287.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/datorusenetonor.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ee61b61579---palet.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/feduxetalulinuwalif.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/52f798ff148d5171eabb7395d5f42252/8895241211.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/xezuwotepazudineg.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161654103590a3---79756274448.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/60627756518.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad60e0eb2---mifukumefi.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_off00012e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 10356 bytes
SHA-256: ee49476a3b6759b654c862d547c55443b6333e078ebf53baf709e8ab6721ea6b
font_01_sfnt_off0001460c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1E 19304 bytes
SHA-256: 6f4ceac5f2e9f647c277f35111afc3f7bca71beb4181bfd9e448aa50d42aa331

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