Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c488dd608230584…

MALICIOUS

PDF

85.0 KB Created: 2021-10-05 15:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2e18b06cc2dce09c708c04c85f2b9d9 SHA-1: 001e32a57b34ebe99284f32226d2f748942551b7 SHA-256: 4c488dd608230584de4f033d4a6c990d9a4200ad2347e90fa42392e87f724099
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating a link farm structure. Some links point to compromised CMS uploads or disposable hosting, suggesting an intent to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://webs.eusko-ikaskuntza.org/files/galeria/files/rexipanopapabi.pdf In PDF document text
    • https://olterus.info/contents/files/45349486536.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/41005380196.pdfIn PDF document text
    • https://binhvi.com/upload/files/jifaliwawitaloduxulaj.pdfIn PDF document text
    • http://schokofontaene.de/idata/vapadejapepiwot.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/14584c319965bf89df6bd8b66fb25dd0/vatewomufilu.pdfIn PDF document text
    • http://budka39.ru/files/kuzurajipafi.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/18160799002.pdfIn PDF document text
    • http://orlickachata.cz/files/files/82223725128.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/7374671173.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210919_5080DBA1C1FF38E5.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vlfvvfonmu3i9ccqo3ttfbvaud/pawokirurejudigido.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137195252362---xodowamebiwaxaj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7014f267e---4011751756.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/32852771545.pdfIn PDF document text
    • http://retrofotr.cz/files/file/kidugozitupawafuzo.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/15710202166.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/24042562505.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akabujulagokofovorokevi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d671fbbb2ecf3773a32d47ec9861b217/davoxolipedetadifo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j1gjmdeuojm49uoa24trbb0ue5/64124427823.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/diretoxuge.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615b33ad2a912---62229565985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=silence+of+the+lambs+dogPDF 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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 18596 bytes
SHA-256: 3908eb9ca18fb0072af4f43da8049b4eb20d2e4af40a5c1a9994c1a01def5018
font_02_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 11040 bytes
SHA-256: 54fe24a96e5b22c05a70d4afac47d0c32ef80d3cca9af2a78e1f3b60f8bcc2f7

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