Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8b4c2703a495b3…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 02:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f10ee9479454c21c0764aef6a7ccdbf SHA-1: 8777768c81472b4b66b36a650ca27a972a99271a SHA-256: 1e8b4c2703a495b3f71d7b97c60fdc9ba15998099b225818bf59c7f60bc2dcd7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm designed to obscure the true malicious destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=siteground+manual+wordpress+transfer PDF link annotation
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/9485753977.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/63062433976.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/45878964727.pdfIn PDF document text
    • https://defi128.com/userfiles/files/nowadan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/908293e9373da73c4f0daac554515f16/zibekolafasi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/86500210116.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/9664936907.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/77688770919.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac6569f07---dogajo.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/74482926473.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c093f909b7753a7bc9cbd9921b99b9b8/busudujepinivokawagekaket.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608588a556865---vafurebaremitaku.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03d5664ed3---luxilapogoxa.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb87f2ec40---fekitebolidalulugijejopim.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/64208579930.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vosomazagojoguverunuzi.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/fekojigazabawagamokuvo.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8b4315d1c8ab1496c6db0c46b0720d35/87341910749.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/25ec4cfc4cd66776ccb22233d973c6ea/12013753911.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076cff858287---7373703583.pdfIn PDF document text
    • http://berbun.com/user_img/file/fekar.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_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 17552 bytes
SHA-256: dac349dff8a3330a5b930dd040c302a2913ee99f1a97a48dcbaa136997a60220
font_01_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 11100 bytes
SHA-256: 55c8ce41ae0f0ea59c7cc38388e4a2743228f0080f94a7d91a1c04aa701b51c0

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