Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20dae6fbfad6fb1…

MALICIOUS

PDF

92.2 KB Created: 2021-07-03 15:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a15df7704cf7a6969584fd2ed40458e7 SHA-1: e3c2c7a5271cec53fe52b514e2d2c72cc22b5f58 SHA-256: f20dae6fbfad6fb1fd404ffbf51f0f2f887f9ff28544587c94e9f48bc5fe138f
176 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of PRC/3D content and the ML classifier's high confidence score further support its malicious nature. The primary goal appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 http://primethailand.com/ckfinder/userfiles/files/baweje.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f283d5caa4---munebipunezaboreko.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e37bc26ae---90836220820.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/q9ef8m4cltb2hqkne1pr1pfqel/jovenoxeb.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609100ee6e7dd---wakal.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c636b57841d---sijilib.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rmfn4bu1qarc6iv0s119sklte2/37734438261.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/70983166594.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/31q3493kr341hpvgeg1utjc05b/kawuwefakurafik.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d9e028a875473edadcae4d78fe258d21/zitobimatelaseku.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a8750c3a0---28001939039.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4da39d862f2a755c9e85fdac762078d1/difim.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/8530014690.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/68638954637.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v832ihakf3gj3coorpn8o9pfl4/fijodokagukofez.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e775fd2340---nevulotadexeteji.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/22944199427.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4091a7508d---fanefokirajupaliruwewofav.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90c97ed22---66741780439.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dccfe218f---defiza.pdf
    • https://istocdukkan.com/userfiles/files/93332049365.pdf
    • https://irantruck.ir/data/file/vafusiwimokuduwo.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e761b1668---moralexibo.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/kadupiwijegubotufodo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5032c81afa---42280707142.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=electron+reduction+potential
    • 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_off0001036f.bin
37311dcbd4da0a01010e15b3046799c71c30e367eb3c509017bf1201b230d999
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 10420 bytes
font_01_sfnt_off00011b16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16792 bytes
font_02_sfnt_off00013328.bin
e2e155708134534e3d21fb14dbdb287979117d7f2f06e892248c15754b284d21
pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 18092 bytes