Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9055a36cfe9775…

MALICIOUS

PDF

74.3 KB Created: 2021-10-08 09:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb60c11030bf8d83c8271b4cec871d1e SHA-1: 08bab5c5007b28fc71ac8d8700159182bc485813 SHA-256: ee9055a36cfe977520083dc688a8636ee8ade376dd5e1a8f250b8f0080f1e159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm to distribute traffic to these sites, likely for malicious purposes such as phishing or malware delivery. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://smidgel.ru/uplcv?utm_term=in+which+season+tulip+grow PDF link annotation
    • https://mahae.hu/files/files/vopox.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/30368394929.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0749464280d17db255384e0de2d87df3/97572666996.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/bizod.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/jukepuxa.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/79494082241.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/31323486145.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/28639101590.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/73684671238.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/rotozuxemolapi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161571ab49aed5---nadezov.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/14671787827.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a58074947402727066aaa82dcf9ed6f8/muwubibadijej.pdfIn PDF document text
    • http://hrudolf.com/userfiles/43674062501.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/vejexuxazokagepevoj.pdfIn PDF document text
    • https://arerp.kr/data/file///81741181168.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/finelevugakepi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/zetizezoronok.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/bagojupinopu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/56143724756.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/wiwodu.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210925022718.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05857c6a0---ragewazomiganata.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210901073045.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/wevuxonipajon.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/bajusijubofu.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/mewinula.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_off0000bebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 10792 bytes
SHA-256: 10adb82e68740e585d781185b2fd3176bc6fc3b2c0858c25ce156f0a80dd4dd8
font_02_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 16980 bytes
SHA-256: 153843ff1b7ece4789286dcf3e94c82ec97d08a178379b17f82db774edfad9f4

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