Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e708c0d931548c…

MALICIOUS

PDF

88.1 KB Created: 2021-07-09 03:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33ab3256cd5c0c107f748e80ec51bb79 SHA-1: 1f6081f1a3cfdf9f3a658add8292ccc1c4e93525 SHA-256: 46e708c0d931548c6a79a7a72c565e6c93a87fbe64da3c436ccde970908791c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts suggests an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=mouse+growing+human+ear PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379cfe0711---73226949632.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/395b36e99fd5af210060d46834842be9/foxuvitev.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e5546a7e69e---kidunobexi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/buzimolagamozi.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/61132948523.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/pewuvapak.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/57477315028.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3jmj4ctk4o4p30foa3mfc1see0/3106351714.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/mufefodifiw.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1b1593692077be16c83131d97ae89f0b/23598803072.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0acc86e292---fadavepojoxenemotome.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/kegumiluzavufujewokupojaw.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/nudutokerilupemimuwaf.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/serinoxajepugixezavija.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/50679388521.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/56028228784.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/zejeroxasunix.pdfIn PDF document text
    • http://intergeored.com/upload/File/teseruru.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210606_230802.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cfe6a704---fegisukeduzot.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o9atqd3pc95jnmbikl41vj03s2/gizubizabifesivini.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kbgs4bnorcoobi1scvpm92f20d/zejexexovuk.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b414e0039ff---mupinagurepopababadujupox.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/muruwetoragot.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8accb2b9---karepataviwokup.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/25/file/20210625_223239_156.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_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 17260 bytes
SHA-256: bc6ab15d013e87f99b7a12bb7d88e17134f13c476a43354ea0c99d6ff96a5b7f
font_01_sfnt_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 10588 bytes
SHA-256: 28ea21458706bceb56cfcd9c8560d6bdaac638b2309f4d35d9e743d78368be7f

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