Malicious PDF — malware analysis report

Static analysis result for SHA-256 719bb7c8f7507444…

MALICIOUS

PDF

83.7 KB Created: 2021-07-01 20:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bc3e37902bf4752ccde065c61e922e3 SHA-1: 3da3c922f544e039dfe1dc3e74d2c5b8d1a0d7ee SHA-256: 719bb7c8f7507444d9cfbcc850c33968be1d6f8123d9d4d6c21647ad535ee0a4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://aspirans.com/files/file/ximojenuzususegi.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bda1f97c---jenugibaxoneruri.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/44f6918131f7dce08044dc7fdb08541a/78330220141.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e1upk39p09h8hqi7kf058ble63/vavawewuletoguwerara.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4171f71c---kukitixaw.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/lufixatiwakatorizozunelod.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae40cc2da---tefovupoxoxawavok.pdf
    • http://huh.hu/UserFiles/File/xolojevupiferogunofuz.pdf
    • http://karthikeyanjayaram.com/userfiles/file/7245566002.pdf
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/ropopefedase.pdf
    • http://www.findvoters.com/userfiles/file/7720630519.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/t1lk53bd3kg0g6b59cn9sol1sk/rapuwekugatupajibo.pdf
    • https://erdemlerkoleji.com/resimler/files/55187793896.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1622366653538.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f4a0e9511dc384e174a23415a6ecd136/46116225093.pdf
    • http://pwmtqatar.net/userfiles/file/59545565245.pdf
    • https://natyabio.com/uploadfiles/71657174944.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2019a12e---xoroj.pdf
    • http://upbfassadenbau.com/upload/file/72400635772.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd6483461---kixegenanozemuleniru.pdf
    • https://bursakaynak.net/userfiles/file/gesosadetego.pdf
    • http://ahlhy.com/uploads/file/281049181830.pdf
    • http://ottotech.center/userfiles/file/42700481596.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43bd281638---poreziviwowezibefonugijes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=maths+olympiad+for+class+5+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
font_01_sfnt_off0000f8f6.bin
fa334f764b4a469f271d22159669b60e75fa55b604c74ef4f1e824acefb02e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 11132 bytes
font_02_sfnt_off0001130c.bin
b12553c6e1dd5f8f42a10d2b542379f337d5ebc52d712072da2a17b7a85d373b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 17096 bytes