Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fd37bf1e7a28d8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-06 19:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3eb48b8e989fd4977e13b16d41136de SHA-1: 645f8e47a79f226f7f6f418ad75327284388c1b8 SHA-256: 83fd37bf1e7a28d867b64cf1b53d642287874f8842a038293204b054beafbfec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself indicate it's likely used as a lure, potentially for phishing or to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://satakantaresort.com/user_img/files/37504738062.pdf In PDF document text
    • http://purofirstli.net/userfiles/file/22401225695.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/16440041386.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2b9cd7fc---10535453796.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/rubodonuriregape.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a290abf17dd---92085294552.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/56080527808.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202108280127207631.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/61909856119.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/dosepebifipa.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/rabupugoxojelogijod.pdfIn PDF document text
    • http://zxsolar.com/d/files/41315610761.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c9fa6a3bde321c49a4314b608880b7ce/retodidotobijozek.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/75671140163.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085126a4efc3---xanulemezovavadebabudor.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/80853912582.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/65d350acfb764acb5b1352d570383573/31079948007.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcd474b9a9---nufamuvedigabonibeb.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/zebikokorurenokujuwa.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/domeganelila.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/18644627531.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/62052387381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=artificial+intelligence+report+pdf+2018PDF 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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 14376 bytes
SHA-256: 4c69dea86a2832839dd60d27ee3db0c89605f5f63600fdf3cc03f6addd1817ee
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 11112 bytes
SHA-256: f425ae978a7c07d807f3df073601ab29cf6eb08c34b810c69dffacadef51394b

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