PDF malware analysis — malicious · 89e5b9fdd8a5f50b

MALICIOUS

PDF

105.3 KB Created: 2021-10-18 13:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 7d4e00e85a590077b119de0567cb35a1 SHA-1: 81b3f5803757811d22c9f70d19308bd4f7db228a SHA-256: 89e5b9fdd8a5f50bbabb2cfc725b71653b3a2e10b9eb5a9cdf41d9f47fa5c382

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for these malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9486

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://nyitotthaz.hu/userfiles/files/xuforek.pdf In PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/925eed59adf9271fb5004ca2853b3189/jugewamonob.pdfIn PDF document text
- https://fzclicks.com/demo/files/editor/file/zumajaropedilulolezugu.pdfIn PDF document text
- https://alansglobalservices.com/ckfinder/userfiles/files/lobizivudibewabezunuj.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021101815520146.pdfIn PDF document text
- http://hanifeugur.com/image/files/lewoparowirolakur.pdfIn PDF document text
- https://ppntassone.it/dati/upload/file/mesitebawakolozu.pdfIn PDF document text
- http://itps-group.com/uploadfiles/file/44716620345.pdfIn PDF document text
- https://smartstone.ca/userfiles/files/rusuwekumovefepotazagiv.pdfIn PDF document text
- http://hnht-electromagnet.com/d/files/39604217569.pdfIn PDF document text
- http://expresskaliski.info/file/17796209361.pdfIn PDF document text
- http://silver1979.com/upload/file/gisiguwabu.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c119380d7a---lofimoxifu.pdfIn PDF document text
- http://greenworx.eu/images/uploads/files/venino.pdfIn PDF document text
- https://thefertilizergranulators.com/d/files/regisobogevuk.pdfIn PDF document text
- http://www.tsahimmongol.com/uploads/images/files/fexunakibavefomaluriku.pdfIn PDF document text
- http://holland-ex.com/images/blog/file/fabaruwesepexejepobaxudet.pdfIn PDF document text
- http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/sexiruvabapediwiniwe.pdfIn PDF document text
- http://mvpbuilding.com/userfiles/file/76102863085.pdfIn PDF document text
- https://tunapvietnam.thietbiotoviet.com/Images_upload/files/2798160886.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a3b4bdb846---wusexum.pdfIn PDF document text
- https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/22023073752.pdfIn PDF document text
- http://picassogift.com/Uploadfiles/files/55711543748.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148f32d3977f---vebaz.pdfIn PDF document text
- https://lesartsdansmonjardin.com/userfiles/file/20211018102731.pdfIn PDF document text
- http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fesizomurabinav.pdfIn PDF document text
- http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=the+battle+cats+legend+stagesPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off0001689b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1689B	16304 bytes
SHA-256: `a9dbf1fe10303fa3049918116905d846050e23db8aa80621cb33f9b8db8427db`
`font_00_sfnt_off0000f980.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF980	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001118d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1118D	7748 bytes
SHA-256: `f5acf7e3e0a0cf08348a01822a924fb80d8f9d9d4ef58ea44c5050b476c279e8`
`font_02_sfnt_off00012c39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C39	23716 bytes
SHA-256: `330a208b9462dacf5b8a296dfb2e5369457a166375cf0bd60c40b73c21f527b3`
`font_04_sfnt_off00017edc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17EDC	10440 bytes
SHA-256: `8868375ddbbadce4b0fde196ce931ed72b9c5b0fbe08e807184762670ca7d6d4`

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