Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68eb1f264b1b972…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 03:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc0282966883539cced08498f483cf57 SHA-1: 61692f5046c9da5c5f7ca530f0d98aec995b20ec SHA-256: f68eb1f264b1b972f727701ff99dbd23a289597c0ca523e51fb7a4bff0f2b81d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://newtarrytowndeli.com/uploads/files/fejexi.pdf In PDF document text
    • http://mobitransjogja.com/files/noxuzobofitipupova.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/53640064353.pdfIn PDF document text
    • http://recviem.ru/img/upload/8211411737.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/kosopidoxidepujukusekova.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/hak1g8eqdpaqj9i35f92asu2ih/95201566815.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2de98e76---jojajaganugumixujobawulop.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb7da4205d---nojadixomugukuwetuzuni.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/birosugatakexufatuxi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16079007e03f45---79076075800.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/2541887311.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/wiwobirekituzo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e09efb8dacd697204a57a3a19026fdc2/pomegun.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/16053456784.pdfIn PDF document text
    • http://jarosi.hu/files/file/53274166137.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/04d6327e9d8e8b7ff6f3507ab2a756c1/45875773260.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1b9f1a193963e77cd01a8aef9ad6a9d4/70722613208.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/dafozevana.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/nabet.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/120c14fd7cef447bfbd92a992365b532/13384164758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=intercultural+dialogue+pdfPDF 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_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 10676 bytes
SHA-256: 2e2c4019f68824e015f901bc41921af4472bab4bec45210b7c5cbfdda46378c7
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 17548 bytes
SHA-256: 5983635bb2438010670c2ba4b21a507b4ebda0ca5b5497976a5c39f342f5d3fa
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1