PDF malware analysis — malicious · 434a8944841d10d5

MALICIOUS

PDF

93.5 KB Created: 2021-09-17 20:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7bf7e521adc687d64ab9c1238298471a SHA-1: 4f3be733ec33537adecb3372a5b392070de8469a SHA-256: 434a8944841d10d58d9c5396700fdc47ea11dd8f810c5b0ab478abd9a6e1b2f2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the malware detection strongly indicate a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9726

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://agcslohian.com/userfiles/file/39308156996.pdf In PDF document text
- http://brukikostka.pl/uploads/page/file/60425192630.pdfIn PDF document text
- http://zdrowejaja.com/Upload/file/10539992143.pdfIn PDF document text
- https://granitnet.hu/editor_up/57665491764.pdfIn PDF document text
- https://rosettes.it/userfiles/file/13561395943.pdfIn PDF document text
- http://xageunion.com/userfiles/file/50173076013.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0bf282a92be82c4f5501b800f1675096/sadet.pdfIn PDF document text
- http://sethhukumchandschool.com/userfiles/file/xetejowezobixajijo.pdfIn PDF document text
- http://kuryakyn.ru/userfiles/file/91664884331.pdfIn PDF document text
- https://m-isc.com/userfiles/file/53563249319.pdfIn PDF document text
- http://www.tobywells.org/media/fckdir/file/14873155179.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136658003e42---36238260509.pdfIn PDF document text
- http://rockycheng.com/ckfinder/userfiles/files/48231396828.pdfIn PDF document text
- https://5of7edwardstreet.com/assets/media/files/jerul.pdfIn PDF document text
- https://nadrozmerne-sklo.cz/uploads/79563380695.pdfIn PDF document text
- https://dnm.tw/uploads/files/202109120615108975.pdfIn PDF document text
- https://hw-power.com/uploads/ckfiles/files/614072bca65d8.pdfIn PDF document text
- http://teormech.ru/teormech/usrimg/file/pipazew.pdfIn PDF document text
- https://daulte.ch/ckfinder/userfiles/files/27111773053.pdfIn PDF document text
- http://starcity-vinhomes.vn/app/webroot/img/files/57965228073.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fdd82db7a6902fddc6c992b680159924/gugedesan.pdfIn PDF document text
- https://marcuspietrek.de/MARCUS/files/file/10033384150.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d89cce20---20255436892.pdfIn PDF document text
- https://surupaceanu.ro/ckfinder/userfiles/files/26699525672.pdfIn PDF document text
- https://maytinhdalat.vn/images/uploads/files/xoxogipulo.pdfIn PDF document text
- http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/bokapalom.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=transcription+app+androidPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000106f2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x106F2	18228 bytes
SHA-256: `2a9b9a67085ef9aa51395134facb4719bd8deca3fe336540f4ad83f23a194a7b`
`font_00_sfnt_off0000eee1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000123b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123B7	10292 bytes
SHA-256: `efe68a754cd80407dd021703dc27b59a6d910ec074d299f4558a150b081904b9`
`font_03_sfnt_off00013afd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AFD	17168 bytes
SHA-256: `d92208bd3383968c745ef5e845c28d56ff2dfe8396afa6838b2ea1b7febb6ccf`

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