Malicious PDF — malware analysis report

Static analysis result for SHA-256 aceb083af72a81b9…

MALICIOUS

PDF

106.4 KB Created: 2021-08-09 02:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52094f72c0fb7ed069fa1e98fb9502cb SHA-1: cf12a972e2c9b139250654d5bc0c84414a36989a SHA-256: aceb083af72a81b9343428d353b98775904793a6eff790b6e9db05681fe89cd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The document's structure and link farm characteristics align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afd22148e---lovatanu.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c496d65ffe---12358319662.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/57351276806.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bdi8vjea70o1iduhic6r5jb9cq/38542742158.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/59411335720.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/liwefekemorewazevaxot.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/dudodawaxexetezofoseka.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210604162284014724.pdfIn PDF document text
    • http://learningkey.org/userfiles/tozebopumixerakidiruleba.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/80329091764.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/2746454698.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb58b9b4ffc---34773359511.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/83493084966.pdfIn PDF document text
    • https://rinducm1.com/contents//files/21859330513.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/96151a0fd62140c8a471b5d9ca9ebdc0/tajajawadamuzexiwafexiv.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/20283342710.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1628438340.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c77063262ef---54778968983.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/mumepu.pdfIn PDF document text
    • http://ligneus.hu/upload/file/73129955609.pdfIn PDF document text
    • https://premiersuli.hu/files/files/90574074704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=glencoe+health+student+activity+workbook+answer+key+chapter+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014c44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C44 17600 bytes
SHA-256: b5f27e50a7eb3a6456a679201e485323d93047758ec595d38150960834fc5d5c
font_00_sfnt_off00011fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDE 16992 bytes
SHA-256: d00b0e0eb89370227d951705fb40e1ad243625db37f80e9f09096728ca83f2ea
font_02_sfnt_off0001675b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1675B 11380 bytes
SHA-256: 75cfc7ea9b99ae688817e76c275160dd2db004602195e65a7032722e2bfa260e
font_03_sfnt_off0001820c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1820C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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