PDF malware analysis — malicious · c15c0f4b60765a05

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 11:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 290bf1f3b57ca0b18ad505534fc563c8 SHA-1: 6bd008816de81e7085551c7f917b981df6af813e SHA-256: c15c0f4b60765a05476909ba24f207cd1e83437e427a4624485daf7c71ce5624

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=gcam+iphone+7+plus+apk PDF link annotation
- https://www.luthier-auxerre.fr/ckfinder/userfiles/files/ladulexarotipatefane.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e1724c5b7f81134849af16f71181ae7d/94263507899.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e2bcaf74---33914776832.pdfIn PDF document text
- https://jakspravnenapsa.cz/userfiles/file/83599815162.pdfIn PDF document text
- http://botaierpharm.com/upload/files/30701149735.pdfIn PDF document text
- http://toptoptraining.ru/img/upload/file/79634555364.pdfIn PDF document text
- http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/35773217692.pdfIn PDF document text
- https://wroclawmodelshow.pl/ckfinder/userfiles/files/5418949066.pdfIn PDF document text
- https://equinox-e.com/upload/files/31635569037.pdfIn PDF document text
- http://massimobertoarchitetto.com/userfiles/files/bujita.pdfIn PDF document text
- http://hindel-relax.ch/ckfinder/userfiles/files/babajopegifumub.pdfIn PDF document text
- http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/ximopusogirimasekasasu.pdfIn PDF document text
- http://infinity-c-t.com/userfiles/file/bofefatunatapumav.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8b53e2b01653784f24d451f2836d4242/mibasemopunaberi.pdfIn PDF document text
- http://pengyou-english.com/FileData/ckfinder/files/20210920_D6D677AF7370AEAD.pdfIn PDF document text
- https://diedacorporation.net/freesiafiles/file/bekuril.pdfIn PDF document text
- http://suncitygroup.ir/basefile/suncitygroupir/files/vimusumasunazasukuz.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161314f2b1a878---bojiburijivefofobawiki.pdfIn PDF document text
- http://dichvu12h.net/userfiles/file/pifofisekorugirunipomak.pdfIn PDF document text
- http://ivelinabozilova.com/userfiles/file/kivajovizulajil.pdfIn PDF document text
- http://citadelcaralarms.com/userfiles/file/dapudixeb.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134370058f3c---48343991756.pdfIn PDF document text
- https://classconnbio.com/img-jacson/files/27129125467.pdfIn PDF document text
- http://sukhonthip.com/file_media/file_image/file/pegivupagoxasegomot.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_off0000d908.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD908	10720 bytes
SHA-256: `d7d8cf03f1c8bc45a7511a298f538f9eb919aaa3e0232ea50326858fd5260eb4`
`font_01_sfnt_off0000f181.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF181	18176 bytes
SHA-256: `d08797e4dde95f291a2c3a91d4bbb219064d4e1fe55331d3793f66e021c634dd`
`font_02_sfnt_off000120c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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