Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf9091eac372c1c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 08:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 304d04f3d431a6472e2f80b7f8bb6780 SHA-1: 645b21ecb29b7c4d96d4d4689d015bdd782fd108 SHA-256: 8bf9091eac372c1cb2af2762aa889348ed0fc386786e7088137da7f9ac206379
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with link farms and compromised CMS uploads, indicating a phishing or credential harvesting campaign. The 'SE_MFA_LURE' heuristic strongly suggests the intent is to trick users into approving multi-factor authentication requests or providing one-time codes. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://allytemp.ru/uplcv?utm_term=android+add+hotmail+account PDF link annotation
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210916134625.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/44755876018.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/31928809023.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381a928ff03---semekevol.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/vubidadovoteb.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/wobojazo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/30780236401.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/juwegoselisevetiwanofar.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/moxazilujopudu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcbf44083e---82962555349.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/vurererodamijadepuwu.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/95921643447.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b2830f21d76ebc9789c6aa219ceb3d71/77918036847.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/78030451362.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/vowinabi.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/70151462100.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/tonifobametipixakemuzifum.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/53677989824.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/pamifigonojebaporinuwizu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/45317136180.pdfIn PDF document text
    • https://mmszke.hu/files/file/lefurenezereb.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/pokabixejufubip.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/zazubipojo.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/33329452508.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/78049031306.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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 17468 bytes
SHA-256: e62edf1e4775133d796e6f664cc7d6283ec1743efe31e0374ad9a8f0cf8b74ee
font_01_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 10416 bytes
SHA-256: cc687590d921736e30e0205b072fc73ccba10a5e2852dea54883627f2aa824ae
font_02_sfnt_off00012c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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