PDF malware analysis — malicious · 850eb1bb2a14efe7

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 01:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: 43ee89294aa97232a6a0946b45dd616f SHA-1: fe3951a7849c3504647d6a29b87357359a09ea34 SHA-256: 850eb1bb2a14efe73867bd7d9186874686c4429fa08115bf1edf32716f0e6b5b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=centrales+termicas+pdf PDF link annotation
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50553c9f0---terikoze.pdfIn PDF document text
- http://greenbrier101.com/userimages/sezebakunas.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/efaca6c255e1d92543a474dedc5d85fb/rojokavegewis.pdfIn PDF document text
- https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a9f7331c784059c9dff3c906e872e77c/5375522928.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160846fd26a771---vexow.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113cb931cce---rubev.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/142553670690a9a0fbf9e19b0a556e13/bomuzusige.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d32131a2---7113198987.pdfIn PDF document text
- http://nuraski.pl/wsg/userfiles/77810207972.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16126a6d5d367a---kemizexax.pdfIn PDF document text
- http://twfindia.in/userfiles/files/38444787681.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5d00d536---9153040642.pdfIn PDF document text
- https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/6e8e1ba9121a8a6cd52cdf9d525c554a/pafepunidiwolezonufubuf.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160865d6c4898e---51985957051.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6st1o3t9c34rulu0q689lf9lu2/95031448785.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3085691d3f---70065147847.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/fnusfe2kk3f6m99u552kv48h75/50965463535.pdfIn PDF document text
- http://occahomesearch.com/userfiles/files/sugago.pdfIn PDF document text
- http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/gikapifofofa.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/rusosukagodo.pdfIn PDF document text
- http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a1gsam4m4khcp10q3u2ik4cbj7/28223566960.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tsi6kl2knfktpuerk0u793geql/50999736483.pdfIn PDF document text
- http://3e-machinery.ru/app/webroot/filesfiles/14529003425.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_off0000dfc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFC2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f7d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7D9	10692 bytes
SHA-256: `61294e4d017cadd870e14661900efbbe533cf2de6815290cf331042578f131e8`
`font_02_sfnt_off00011054.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11054	19200 bytes
SHA-256: `8086af9172001900812c1fdb2f43ec1035ca3814a71ddcdac0bb5a3c03a95c9c`

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