PDF malware analysis — malicious · a6d54c762f7d7f9b

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 12:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 082162dec4dddea5cc79af2ad3bdf8dd SHA-1: 413399872230617412173469e5d5d176db2a6e5d SHA-256: a6d54c762f7d7f9bd7bbcfa64741e7c805f6fb314ea505a4b4b75376be152c3b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites. The link farm structure, with multiple URLs hosted on various domains, is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=friday+night+unblocked PDF link annotation
- http://nhasachnguyenvancu.com/Images_upload/files/19247476567.pdfIn PDF document text
- https://baatco.com/ckfinder/userfiles/files/5387612951.pdfIn PDF document text
- http://greenhere.cn/upload/ckimg/files/202109171045577592.pdfIn PDF document text
- https://www.groupe-coelho.fr/ckfinder/userfiles/files/51139868828.pdfIn PDF document text
- http://smart-ventures.ch/upload/Editor_Images/files/dojawopabibenot.pdfIn PDF document text
- http://chineseclothingonline.net/File/62091125151.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5bfa97f01---furuzutarudi.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cafa2990842d240e7e20272d6263d441/743582186.pdfIn PDF document text
- http://rund.cz/UserFiles/File/bavixag.pdfIn PDF document text
- http://www.urbanwaterways.info/files/jewuv.pdfIn PDF document text
- http://canoto.us/Images_upload/files/54872043010.pdfIn PDF document text
- https://stayinbranson.com/ckfinder/triplebuserfiles/file/99666944139.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e819f2fbab---591737140.pdfIn PDF document text
- http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zufutawolowag.pdfIn PDF document text
- https://unitjaya.com/contents/files/dixapafujiposefoda.pdfIn PDF document text
- http://tomei4x4.jp/js/upload/files/gosevalura.pdfIn PDF document text
- http://civicwomen.com/ckfiles/files/63395244393.pdfIn PDF document text
- http://pogotowienaukowe.com/Upload/file/mogugisasasamuxudox.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1677cbfb19b7e0805686c1cd76d6ae39/mapovuzowobep.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/85a514a9776830faa828098788f8c914/tozaraleguv.pdfIn PDF document text
- http://huspanda.com/data/ckfinder/files/baxazarakuxodezapigirate.pdfIn PDF document text
- http://dynamic1984.com/user_file/file/89459656332.pdfIn PDF document text
- http://nebovsem.ru/app/webroot/files/files/68747411689.pdfIn PDF document text
- http://jiendurancecoaching.com/ckfinder/userfiles/files/76828986586.pdfIn PDF document text
- http://gu-bo.cn/uploads/files/45961653184.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b3e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3E8	15056 bytes
SHA-256: `3b9c6a61dc81713e5a081c5ab3eeb0b01ed195b17d143a934788f26242a49e95`
`font_01_sfnt_off0000da31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA31	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f248.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF248	10904 bytes
SHA-256: `d09dcb91252a810dc7f2face928b4bae7ea55f885e22002960032da894f01c47`

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