Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebbada403f5ae94…

MALICIOUS

PDF

80.4 KB Created: 2021-08-27 20:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc4fee3be5c0ceea245ea9948c72dd16 SHA-1: fe72e71a83edda26df76d484018e2774bec3da63 SHA-256: aebbada403f5ae9406abda3e8c1740ed2c547aa169b30b0931a581e3514aa20e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/99347911968.pdf In PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/fizezemanegarasu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de8b0d19186660d19235f75ac3714a95/38064896034.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/76695139512.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/bojuweme.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/pajekupakimemuzenuz.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4a50d968---surowutuzudurabemovo.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/lomewegoxakawoja.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/972288552afa8beb3f4e2d1890a761c8/nugufopetikoxixapema.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/gexatilimodomusixivovili.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6ed8133bf01394e28dd0011492eab431/bamigizuwowibexuwijotoli.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/mapaxemejekifasofakoz.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/bosanumatalup.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24df14c785---23461108860.pdfIn PDF document text
    • http://runo34.ru/attachments/file/fekowepizibebik.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/81479985272.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acae1ff1b4f---99213329854.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/nuvonotilelaraboli.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lokebodin.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/88295214143.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcadbd46d12---81441131114.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c3237914---61100042410.pdfPDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822b9bca3b7---nivitasujuzavubukamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=computer+mouse+wont+workPDF 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_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 16244 bytes
SHA-256: db302150ecf59c0a59cb39f9e320bba36e71474e497874e485bac7854f7c30dd
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 10424 bytes
SHA-256: 8a72a89e7eae494d5af7f36fd39727358c96e000a9b1f5fe091dd2b58e7a5ded
font_02_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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