PDF malware analysis — malicious · faf07bb96a7223a3

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 13:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 4d6e1bf8bd4976c4ffbd79e877376e43 SHA-1: 4c23d6dc0548c74fb05eb9a8a3ff1c706039c9fa SHA-256: faf07bb96a7223a373b63bbb1d1d0ee81712e054e4e97a780fb7b44f644c5026

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting an effort to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=sausage+recipes+pdf PDF link annotation
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cf7cf151---zigorofabotive.pdfIn PDF document text
- https://questyme.com/userfiles/file/31934875302.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d38519058a42016cb873ba1ef30baed2/72613554169.pdfIn PDF document text
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/07ff88d86af4ee01bab8c51f4db6235b/45454793699.pdfIn PDF document text
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f263864ab044c24387aa5382e005fa35/14137743399.pdfIn PDF document text
- https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9l2ij95mrc06ieavb09u6uc5os/rukuzizasikutubotaluk.pdfIn PDF document text
- http://hzzxtl.com/UploadFile/file/20210706034941951.pdfIn PDF document text
- http://heldermusic.nl/ckfinder/userfiles/files/zomupukiwutadilupakaxad.pdfIn PDF document text
- https://landbar.com/upload/files/45725060520.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/699f7cf21386366906e731e155b7a990/zikevowajaxefejelagadewi.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ad50c63f---68785610357.pdfIn PDF document text
- http://xn--80aab8aioy.xn--p1ai/userfiles/file/furegolusorazubikot.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/29573435661.pdfIn PDF document text
- https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f393b38d8c---fewemudekaz.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d54dae81---zoziv.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb28325d4d7---vikulugunopugavilaf.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c05a0347e4---73020838461.pdfIn PDF document text
- https://ever-progress.com/upload/files/fokepewozejo.pdfIn PDF document text
- http://citysuji.com/ckfinder/userfiles/files/94540012765.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612942e142473---tuxevibuxizub.pdfIn PDF document text
- https://fleuriste79.fr/ckfinder/userfiles/files/mebipajolowetikin.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5ba3287e9---kamuxelulikoli.pdfIn PDF document text
- https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4c6e10c73347416a3a5e24ac72c851fe/xowobojaxusovowegono.pdfIn PDF document text
- http://onlineticketreview.com/images/file/pogewixo.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d0956d68b66a8f4722c3559268ec6396/lodanuvebiruvanojozav.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_off0000f1b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1B9	17388 bytes
SHA-256: `2f60eddd6817f5dc8cdf9fada9134d751d76ca3999c5cdd3e94209ddeb090968`
`font_01_sfnt_off00011ede.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EDE	10604 bytes
SHA-256: `079c35b9914a3393e64cde22e6549f79bde616a9e58bb3106ddcf72d1ba86fcd`
`font_02_sfnt_off000136f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x136F4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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