Malicious PDF — malware analysis report

Static analysis result for SHA-256 1176e1fba9e2d914…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 11:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54ad114c3c4e13b5d585c6bd3aac64f7 SHA-1: 53e65994019065d5dc7ae8b67b697af189b50f87 SHA-256: 1176e1fba9e2d914060cdd1db36ef9eefddb74cf39ae786f56ab9c3bced7b206
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u9a48ns1ht8707gd2bfiqi7g02/berosizepagafelowewomob.pdf In PDF document text
    • http://prplus4u.com/ckupload/files/vokobelu.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/zezedotepafokeviw.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/74795821942.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/70810118049.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/39586990320.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/36891830065.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a926c98f5fe---10360859884.pdfIn PDF document text
    • http://hanifeugur.com/image/files/libobamogogesel.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/84273795703.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/tofufatemamoxubofamajoz.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/lasubapifoli.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/0memm1ua7370f0j3dd85tvhrjg/75706368416.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/56376026792.pdfIn PDF document text
    • https://giustofiori.it/file/bamubosobagawetaru.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/gakedijevobubig.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/9675726034.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/sozagezagig.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sarumi.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2b94ebfe---22811774926.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118afa5cfa36---52126708915.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kadozole.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/48077567762.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086b6cbcee---29349992380.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d9cbf39040d872eb4112a0f80c0c3231/lekulojejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pie+chart+examples+with+explanation+pdfPDF 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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 17796 bytes
SHA-256: 3e7338d5a4e9248890fb4d092d5e61a1ea0527ec6f17bd6cf244d4512266569d
font_01_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 11076 bytes
SHA-256: 26d1aae21ae8d20b3ab5af78a579a4792efd240a523e7c35fb662c5d7ac825b5
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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