Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b4be264a6ac46c…

MALICIOUS

PDF

84.9 KB Created: 2021-08-04 08:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62c4c9c5eabafa313a0887c946a42fd5 SHA-1: 42c560f846a3b1c2355976beeecd6a94e7f0a5b4 SHA-256: a2b4be264a6ac46c0e7f3a64f3b26c4463ba09fd954593314dde126b4f648f55
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fitness-sport.it/userfiles/file/40445963875.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ecc810a0---pizebefaxomemexaposuwabeg.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/593ce43829f6f8f0f3115a57a19dec6c/gokoxogetogosasuxo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/298a05b39ebb45683eb5f16cce985b7d/xasux.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/kikubetijaka.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/pogitunenaxosebirixafip.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210609_6F80F2D9770E2C4D.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/57967142349.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fupux.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/12453113399.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/fotibokad.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/semidugufada.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/95196618467.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/82581185465.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/fedujafev.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/564b0c24ca8015bf083c6f66da198850/37101259002.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6cc162606---xizejarid.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/xopopuz.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/49616747164.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m5fttqehobbu94dj1g0qlfrsgh/25464561140.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/deraginoparipuda.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/9618007813.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/tebavejunazuvojovibirape.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/84195742987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=significant+figures+worksheet+answersPDF 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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16272 bytes
SHA-256: 7c4c412a26a47176758fcfc1ce4822677272ff175e7920b690d2be9f5431353e
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 10924 bytes
SHA-256: 495bfd23db674aab570618c05d11085047c0f5f0232e04a2800487463c527ac8

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