PDF malware analysis — malicious · 55a227b836f16dec

MALICIOUS

PDF

72.9 KB Created: 2021-09-08 20:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c428ddc3dd2a41295b307ebfeac6373c SHA-1: cc81943225954cd575d9d832972b8bb1bc622005 SHA-256: 55a227b836f16dec31c60629625814c04033bb5e3f808ebd469fd07d97b9cc84

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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and URL patterns are consistent with a malicious PDF used to lure victims into clicking on malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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://archism.ru/uplcv?utm_term=printable+30+day+ketogenic+diet+plan+pdf PDF link annotation
- http://beautifulmoda.com/userfiles/files/bidufavuliwigireberi.pdfIn PDF document text
- http://fotofolliasanlazzaro.it/userfiles/files/1914809593.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bce4e0d910042307a8aa417c19c0bb15/vegabusejutufajimewizetux.pdfIn PDF document text
- http://fbrasil.com/userfiles/file///88490297900.pdfIn PDF document text
- http://abakus-routing.co.uk/ckfinder/userfiles/files/robobuzenada.pdfIn PDF document text
- https://szpital-sulecin.pl/images/fckfiles/file/53935399019.pdfIn PDF document text
- https://elger.cz/fckphotos/file/vunakijunikoxexev.pdfIn PDF document text
- https://phu-komplex.pl/pliki/file/zetujusapevis.pdfIn PDF document text
- http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631075178/files/62459319678.pdfIn PDF document text
- http://macierz-grodziec.org/files/file/rokodasidaxolexisewudu.pdfIn PDF document text
- http://ourpreferred.com/userfiles/files/23297632924.pdfIn PDF document text
- http://wingmanresearch.com/userfiles/files/tiwekabexexozabitu.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a7a1ba5b5c77cd47c907c2666b457e2c/fexewikilikojazolem.pdfIn PDF document text
- https://penzionradvanice.cz/res/file/75060114647.pdfIn PDF document text
- https://zegaoyun.com/calisma2/files/uploads/24848819035.pdfIn PDF document text
- http://cafesezony.ru/fck_editor_files/files/15994276991.pdfIn PDF document text
- http://ototavandosemesi.com/resimler/file/11971408268.pdfIn PDF document text
- http://asia-test.informacittadino.net/media/files/26511345898.pdfIn PDF document text
- http://sipsak.nl/userfiles/file/47544170535.pdfIn PDF document text
- https://edusfera.pl/upload/file/91667038217.pdfIn PDF document text
- http://bilafafafa.com/shopadmin/upload/files/46112417548.pdfIn PDF document text
- https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/xujujegogeveromiw.pdfIn PDF document text
- http://xn--80aamwn.xn--p1ai/userfiles/file/pasuxubedujomazitusupexuw.pdfIn PDF document text
- http://azseal.net/uploads/userfiles/file/87329519531.pdfIn PDF document text
- http://geoman.cz/data/file/2123451299.pdfIn PDF document text
- https://ceramicasvillaflor.cl/UserFiles/File/48785418944.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161387d37cd9f1---64459290903.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_off0000b9d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9D1	11268 bytes
SHA-256: `be51d6f195183d8e21850a2ad8d123edfa8f7276ef1689b399135b6ddb774039`
`font_01_sfnt_off0000d3f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3F3	16172 bytes
SHA-256: `00bc6f01eb2e066e1d0c5cb0c3b8499ac2fb3b74a678fb96bb2e257a584d5bbd`
`font_02_sfnt_off0000fd80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD80	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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