Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30e010cfabd7a44…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 17:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20be6686ea6233b71692e32817830038 SHA-1: 01d787d624e88e2c5dc2c56b7719cfd7d6b33c4a SHA-256: d30e010cfabd7a4454308eb6f6155a47cd3e1ebecd2ad1984ab55da6ebfb31e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement, likely for phishing or malware distribution purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=pc+games+download+free+android PDF link annotation
    • http://www.gieskestukadoors.nl/ckfinder/files/files/mumonevokofirexujilanonu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hppo6i5aduqfnadi2ti1fs72d7/42397084141.pdfIn PDF document text
    • https://angkagenap.com/contents/files/17224626817.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8cd2fb3e8e9c5d4dab83d5c2619d5c61/rubitugolowekulef.pdfIn PDF document text
    • https://nexusmediation.nl/files/zejasukewelopukezetinem.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/nuniralulatuxamofaxidi.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/67927783626.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210904054638003.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/vipugam.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/davakedowuvunenedibu.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/keferekaz.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/dazamazezitop.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/jetaw.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/31082819643.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/92854938546.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/97697569377.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/20444988572.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/42887714531.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/40377946013.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330cad826b2---lilaliserezimegoli.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/jasadajolizugaweken.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/12245437977.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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 10808 bytes
SHA-256: 318a3e3d146ba69033a6e4b40fc36231fcf8fcf4ce436b9f3563d2001c48e520
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 17768 bytes
SHA-256: c592f843a2c9bd816461f106441425c35322a8b5fea7f6d24311ed6eb993193b