Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed807353e3d1b1ae…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 13:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6c56fd5d2822715e123283bccf5c6c9 SHA-1: 5660931fa6f9eb24a7d39b767810bb0ad09ef7d4 SHA-256: ed807353e3d1b1aeedbd72234ee58ea6ba3d098bc9636ea416d85fe61fee1ef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://damnoen.com/ckfinder/pho/files/lekegolufuwosa.pdf In PDF document text
    • http://metapolar.hu/tmp/42430407485.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/funabusafisawipaxufuzijoz.pdfIn PDF document text
    • https://bagstyle.uz/images/file/35190072738.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/23480844911.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/91743456126.pdfIn PDF document text
    • http://manu-transport.com/documents/file/tisodak.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/gupirijor.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/31886671282.pdfIn PDF document text
    • http://hrudolf.com/userfiles/66212676605.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/13099710492.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/siwonepazowobomuvop.pdfIn PDF document text
    • http://tayles.com/uploaded/rajige.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/37765854030.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/moziwez.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dc63a72140de41e10fb4d5e63c0c7b20/warukefevorenekunuk.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/suduvapi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vt959a9omdfv0h0qofr33eb21i/73634690474.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ec0dc68d---55695326543.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/12403298967.pdfIn PDF document text
    • http://citra.cl/userfiles/file/jolukisuvebiputoladexoki.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/jidize.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/gaziku.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/titifudofopijigimesasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+6+download+for+android+no+verificationPDF 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_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 10660 bytes
SHA-256: f117a224f75b1ba71c4d48a2e47caf461c76cbabac8ab64760e7b85a59675d14
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17428 bytes
SHA-256: df42bbea97f6b4d156c30f69f803e37b8274efcd062d0f54b83b161d75ae0554
font_02_sfnt_off000112ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1