Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1a260228a969dd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 19:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c45eebe8f29ba932cf2419ca7edeedc SHA-1: 880dfa12f0554e42cd6784b159bc8686d43004e4 SHA-256: 3b1a260228a969dd0024b963d7884ac11df3919974f3cf44992dedaa552dd5a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=csir+net+syllabus+chemistry+pdf PDF link annotation
    • http://zhengfutz.com/v15/Upload/file/20216242314397436.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/7640666222.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06c923f583---sojivud.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/a5nkck8iiu05rq9v3h5vsqlope/xosojuwuwiwirezanuv.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/80022632949.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/bekafaleseranuxagoj.pdfIn PDF document text
    • https://network-italia.com/file/lujajulidixamexe.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/93604229d7dfa31578865b15e185daf4/66336092027.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/ruwitelifoniniladijudu.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/dunefid.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608601e17065b---judesupawusuneresaderales.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e7cd8161215527daab650251e2f25929/zarifuwexerimimodukosum.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/s1g13cnfhpm40tkah4dbui6j4d/32953561767.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e5f574f5---39096987956.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/53657931590.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/41814759850.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e2632775aba964f3ffeff17968e46d3b/refopavorevigowijegi.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/14015585806.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/40b4c0b43c1211569f4b07e166317170/96847100699.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/97305847907.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/bosinosigedulotoxafo.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ee4lirt6a04mi19mn1tc1dn2o5/xazeruza.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0718253b327e67a1c9f45f7abd66ab52/dujimabomipovepimuzadi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 18112 bytes
SHA-256: 24022f509d089c6b9dbc049e837c11e8debc39077b1e4ae854dbd99bc3b749b9
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 11152 bytes
SHA-256: 5e3eac50f33e279f6880a865d56e19cc4942ad817a9101791526709c09769844

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