PDF malware analysis — malicious · b267968165e5a6d4

MALICIOUS

PDF

82.9 KB Created: 2021-08-21 05:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: b5d9d602e90975e86fc7b798d676cc0b SHA-1: 51d4c8e50e4ca54d12ffa0bb529240db80685b53 SHA-256: b267968165e5a6d4491d6a280d21a06b7ff4ac09ab68180d4453e9acb62fd39f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations acting as link farms. These links likely lead to phishing or malware distribution sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=board+kings+codes PDF link annotation
- http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vqqm9tnifnoefckfal879akbq3/marujokuwitewos.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ef0c0ab5541a43de5dd36ea8bcbb3c01/lumaku.pdfIn PDF document text
- http://windmill-bv.com/userfiles/files/36402882719.pdfIn PDF document text
- https://alamansyria.com/userfiles/file/mubepezabizili.pdfIn PDF document text
- http://keralabiblesociety.com/fck_uploads/file/69498327806.pdfIn PDF document text
- https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/a7pv0qifecjo1bf6o164s4nri4/13174308240.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3492db1e---misududukifuwevon.pdfIn PDF document text
- http://naasschoolofmotoring.ie/fckeditor/userfiles/file/67245030198.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b3dd05d59---83392013222.pdfIn PDF document text
- http://standrewsparishhighschoolclassof1964.com/clients/70428/File/55686387048.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/vusawazatasenalivurip.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094359a3bb28---34549833696.pdfIn PDF document text
- https://uleiuri.ro/userfiles/file/2571905541.pdfIn PDF document text
- http://keyflounge.nl/userfiles/file/wubolalefufidemosowe.pdfIn PDF document text
- http://opakowania-loga.pl/zdjecia/fotki/file/mapalovolejotapuledosov.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/820e5a6a688bb8cae9b9237857436b7c/57820147766.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/57296f6919bc79c3ccb3564c6d78652d/vagisapofikiv.pdfIn PDF document text
- http://vivaldiskibus.com/FileData/ckfinder/files/20210802_FBB12B7F4E3ACF8F.pdfIn PDF document text
- https://harrisitalia.it/uploads/file/jabuvabeperesozamulutes.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cff599f6aef3d9ef42d0295e161ba4ca/56943664918.pdfIn PDF document text
- http://mpti.ru/userfiles/file/59034582152.pdfIn PDF document text
- https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/494335552f0b47ff7cb5fb3737cc0f4d/mokemi.pdfIn PDF document text
- http://buergerforum-tirol.at/file/tokilazobibimodoxogojiv.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081427318be9---zalubudamuxiku.pdfIn PDF document text
- http://abwingssuffolk1.com/uploads/files/80485913167.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_off0000e0e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0E6	17520 bytes
SHA-256: `896441f3dd0473b7d8de48af83de236af5d81934f4db51631fa83410d04916c1`
`font_01_sfnt_off00010e79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E79	10548 bytes
SHA-256: `25c8c8127dde6282f901c252fe907281096c73ba02cfdfb42168345ab914f421`
`font_02_sfnt_off00012670.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12670	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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