Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2ce82f02a9070a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 23:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5cf09c50fa8b1aa0166d06500592d125 SHA-1: cef439aeb9239a2e82a210e6611a8f50788d2c9a SHA-256: 8a2ce82f02a9070aafbd9afa4b3cf470ca5c8ef312a67cf15803a9a98eb2f5bf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised or disposable domains. The presence of numerous unknown reputation URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://skncn.com/u/files/22107428321.pdf In PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/19779414809.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/fobefokiluzirotunanufiwi.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/24800359068.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109070516288408.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/94281822931.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/62728744741.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/bugamuwitafixixetak.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613458f16a0e4---zifit.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/39103206681.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/80648287384.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/86905724310.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/tosulosi.pdfIn PDF document text
    • http://cascad-trans.ru/files/vibika.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/lipizobimuzidenitegabag.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/4431160062.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/92627162965.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gowitufefuxatuborod.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5f90356f441011f7afc1135494f653c/8330722325.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/90375345154.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/88143262324.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe82818cc3---ladumonikofewidokevo.pdfIn PDF document text
    • http://skisun.it/userfiles/files/nikod.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/29315598523.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/dovij.pdfIn PDF document text
    • http://chieucoingason.vn/files/sifijubopowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=emotional+first+aid+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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 10508 bytes
SHA-256: db9ea93840f7bf99ac04fdfa633095fadd7cf0c32b5de36e670995a316c9387a
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 17684 bytes
SHA-256: c58457d309eedabd440d33056449531d20fbe4feedc0a7c44eb4ab78ef05294e