PDF malware analysis — malicious · f9baf307edf043d9

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 10:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: ebd649b82f63f235a799653d39d32cca SHA-1: 11c605e3226b1ef98c75976e3ce729eea2c8ea83 SHA-256: f9baf307edf043d9015e445f248e2a71b7a94137578680248d291bb5d1722ebf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=apk+hacking+mod PDF link annotation
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b2929264f66054cee7a5dbbd2994cea1/digujawox.pdfIn PDF document text
- http://lammermoor.net/imagenes/file/13161454456.pdfIn PDF document text
- https://webmenuplus.com/images/file/lefole.pdfIn PDF document text
- https://www.allduniv.ac.in/ckfinder/userfiles/files/begokurasux.pdfIn PDF document text
- http://isvpro.com/custom/files/22416985797.pdfIn PDF document text
- http://neoneofitou.com/ckfinder/userfiles/files/zapopifadoj.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j4to6gsgpl4jkr1mkifpmal509/44059158248.pdfIn PDF document text
- http://lycee-elm.org/userfiles/file/57845341467.pdfIn PDF document text
- https://orangcar.com/app/webroot/upload/files/75027062516.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.com/upload/files/mutom.pdfIn PDF document text
- https://serpavenger.com/ckfinder/userfiles/files/8050241222.pdfIn PDF document text
- https://divanich96.ru/admin/ckfinder/userfiles/files/saperosejow.pdfIn PDF document text
- http://asqcert.net/files/files/19156446341.pdfIn PDF document text
- http://siripanyalamphun.com/user_img/files/jatiruka.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e792657ef---diperomadumaraludarexuzo.pdfIn PDF document text
- http://www.saletime.gr/admin/fckfiles/file/gesolelewejepoxonalitesit.pdfIn PDF document text
- https://babetravelling.com/ckfinder/userfiles2/files/milubasodotetepa.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d803292775cf0189ab0a3fd1776d72ea/tusadi.pdfIn PDF document text
- http://infiniti.e-library.tw/uploads/files/nadetaka.pdfIn PDF document text
- http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614733e0483a3---somegitu.pdfIn PDF document text
- https://afmiletisim.com/resimler/files/joxibonuzaburivofi.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/gqq6sfucq4fgu8pj4qpvsdkusf/50808090478.pdfIn PDF document text
- https://sabresources.com/FCKuploads/file/87221831334.pdfIn PDF document text
- https://wildnaturetravel.com/File/59100926641.pdfIn PDF document text
- http://beiwendq.com/data/attachment/file/fizaxufefuxudotow.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_off0000b4e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ccf7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCF7	10492 bytes
SHA-256: `2966fd0268567ee3be3fdffa2eab2251af5e910589f66ded0a48656e38d55775`
`font_02_sfnt_off0000e466.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE466	15896 bytes
SHA-256: `f831a2da9fac81b8d5d53c173df8f5a2c60b4f6d0e2196c796cb9204cb1080aa`

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