Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3d0d1941364ba6…

MALICIOUS

PDF

67.4 KB Created: 2021-09-24 19:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 397ef9e595a2e338bae16b8afe8e9c31 SHA-1: 115a94ebcb75f432ff38bb76ed44814187d6268b SHA-256: aa3d0d1941364ba637d9cc5c19aca89d60492ad9f680c770d6dd232daeda067c
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical of phishing campaigns, containing numerous links to potentially malicious external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a compromised WordPress upload or other disposable hosting sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://baigeleather.com/userfiles/file/zititogekebisigolelixax.pdf In PDF document text
    • https://pasarangroup2.com/contents/files/19825413541.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/pilinadezelilanagisaj.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/zodimuxedujategiwurojat.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/metenizuxosabijeluzum.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/pebepatiwazidewun.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/80237469612.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c4004106---teguso.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/62667111851.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/75885475574.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/32301952120.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d87df90a31---vapimujen.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/laxav.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/bakusanetax.pdfIn PDF document text
    • http://szm.hu/userfiles/file/waxed.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc76f6b2---87357944837.pdfIn PDF document text
    • http://it-hair.com/userfiles/51193824134.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7284e2e0---75995198460.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/rabisepelerit.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/zosokasuwete.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/44577199087.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/sorovadosesimavubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+backtrack+for+androidPDF 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_off0000acc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC5 10488 bytes
SHA-256: 41283cff91d2ed7e3e8e32245acb36f88942ae4a751de7e25687eb23f9840884
font_01_sfnt_off0000c4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BE 14444 bytes
SHA-256: 6f25e04f7ec1edb8b8caebc29c73d3b09dffd7ec6f9ae0929c6d7777858de095
font_02_sfnt_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1