Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d742866da35a9a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 07:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03b8ab80466fdc6793f0ad7712868e55 SHA-1: f1044e58af394fa2a4eff4c372def8b99b509583 SHA-256: e3d742866da35a9a16fb79e610b1bedaed265894607e51b84941aa6e86defdc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=get+ig+followers+apk PDF link annotation
    • https://birsamundapark.in/userfiles/files/32849631701.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/9498649014.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/jilipipexugopab.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136856326d78---jefejikigu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/otez.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/78979423541.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/61814385858.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109060920412142.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/nodetipi.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/5524690963.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/pozizeroparur.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/13455432777.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/24066178310.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/zisewajabonobuwaf.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/83700567006.pdfIn PDF document text
    • http://health-bridge.in/upload/file/19049470733.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/doboxagozalerunexibize.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/85709403168.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/wisesulokasipavelezuze.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/48613987651.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9938b0c5e---27070145293.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ce822de6---21773198094.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/20180425908.pdfIn PDF document text
    • https://businesslife.com/content/file/nafulapiwovoju.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/35096462397.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69863018795.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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10648 bytes
SHA-256: 161a3b50c9cbea7bfad074bd6bdb9d1c54f1bb28217766fc0f46492b12ce4eef
font_02_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 21336 bytes
SHA-256: 840c25f5b670db8f67bd80f25ec24af756c4f5b76661679c4417df7693dd20a5

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