PDF malware analysis — malicious · 44b613f5e3566b41

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 09:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 517923991e24fb922bdd667fba4425cf SHA-1: fddbf8eb97106ac1e0010edc0a85dcdf3f59460e SHA-256: 44b613f5e3566b41be40d09a5d258056d798877dbde6da55411ae348b5654cc5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://infrive.ru/uplcv?utm_term=find+notifications+on+android PDF link annotation
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47293a7afffdcf4d3e7c2e7f695855d5/pojutupasagisanomakeniv.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161359c9c97747---kujalapivavoxemezijajegu.pdfIn PDF document text
- https://kentacademymiango.com/userfiles/file/balovataxojoximepofipo.pdfIn PDF document text
- http://asea-admin.com/_userfiles/file/20210912101651.pdfIn PDF document text
- http://statsale.com/data/upload/ck/files/duxozaxawoforetuwelunemo.pdfIn PDF document text
- http://alessandrobelleseveterinario.eu/userfiles/files/1341177817.pdfIn PDF document text
- http://drthchowdary.net/userfiles/file/nujus.pdfIn PDF document text
- https://promise-land.com/upload/file/loluzaxexono.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d3bbc209eef19dce4ca3b64d26e6068f/4593231741.pdfIn PDF document text
- https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c61e0b8427151cc1d7fc84aaaaff1b94/70319751663.pdfIn PDF document text
- http://gammatradings.com/userfiles/file/63946940048.pdfIn PDF document text
- http://vagtteam.com/userfiles/Files/56840136219.pdfIn PDF document text
- https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/dedozepilosexefoxoxenenu.pdfIn PDF document text
- http://stellarvvv.ru/ckfinder/userfiles/files/18462197584.pdfIn PDF document text
- https://handinhand-daycare.com/ckfinder/userfiles/files/92944319932.pdfIn PDF document text
- http://kosmonautika.ee/ckfinder/userfiles/files/majebepewe.pdfIn PDF document text
- https://ferdavagnar.is/images/fck/file/22615459893.pdfIn PDF document text
- https://gestionarival.com/userfiles/file/16627685167.pdfIn PDF document text
- http://m-camper.ru/ckfinder/userfiles/files/vufogedivitori.pdfIn PDF document text
- https://webshopplus.nl/app/webroot/files/userfiles/files/76070979171.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/88667923061.pdfIn PDF document text
- http://wmc21.com/ckupload/files/lukexunapuni.pdfIn PDF document text
- http://kag.fr/userfiles/file/54983224081.pdfIn PDF document text
- http://kashima.cc/userfiles/file/85524044597.pdfIn PDF document text
- http://recuva.kr/upload/fck_img/1631219258/file/65803632103.pdfIn PDF document text
- https://iwanbim.com/userfiles/files/lugotajusoji.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_off0000b4e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4E7	10268 bytes
SHA-256: `353b44cb617c83ef4676ad0c76c7ae3507e6080b31f061254a9787cfcb9316b1`
`font_01_sfnt_off0000cc16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC16	16196 bytes
SHA-256: `324ad02742d63e5d7c5e48309dc084eac33f7fad6025cb36895e130921f697fa`
`font_02_sfnt_off0000f43c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF43C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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