PDF malware analysis — malicious · c095d63155687f08

MALICIOUS

PDF

74.6 KB Created: 2021-09-26 06:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 846ffc5a82fb42c16c7663b858d1fd1c SHA-1: 94ba73c5da2b3f1c708ec5d3a66a9d5410bcfe78 SHA-256: c095d63155687f08a34acafda76ae3e8073248851bf329be3f2c941a447d5e54

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=mi+music+player+apk PDF link annotation
- http://bscartridge.com/pic/54945689661.pdfIn PDF document text
- https://tutorbolivia.com/userfiles/file/nigilokavexegamubowove.pdfIn PDF document text
- http://robfredo.com/userfiles/file/20859685457.pdfIn PDF document text
- http://cdmatik.com/uploads/file/52173880490.pdfIn PDF document text
- https://clubkdo.fr/img/pics/files/98756930970.pdfIn PDF document text
- https://ferropula.hr/files/26649985761.pdfIn PDF document text
- http://canxetaidientu.com/images/file/pufapanavidiminafeti.pdfIn PDF document text
- https://stratasphere.online/userfiles/file/dakorapu.pdfIn PDF document text
- http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/3416942629.pdfIn PDF document text
- http://www.culturehousesun.org/photos/file/nibijudugebasuvisis.pdfIn PDF document text
- http://cementfeet.com/userfiles/file/20494188190.pdfIn PDF document text
- http://villapellegrino.it/userfiles/files/bafanibozo.pdfIn PDF document text
- http://ancient-theater.gr/media/file/12406078239.pdfIn PDF document text
- http://istihdamhaberleri.com/upload/ckfinder/files/66832894214.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/8809301852.pdfIn PDF document text
- http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/94041782200.pdfIn PDF document text
- http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a70528b9b---44087869092.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147098f6a5ac---8727806893.pdfIn PDF document text
- http://taeguektour.com/FileData/ckfinder/files/20210903_50F2A73E557665F0.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614727cc10d9d---75492397640.pdfIn PDF document text
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141adc788d34---dokezujokekiseb.pdfIn PDF document text
- http://predit.ru/admin/ckfinder/userfiles/files/xaxapuxijifeduga.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c359b2f21a---lobaxoxabaxalufabat.pdfIn PDF document text
- http://oprandi.it/userfiles/files/87759738084.pdfIn PDF document text
- http://drsuthichai.com/userfiles/files/1993147951.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_off0000b8b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8B2	20888 bytes
SHA-256: `4b6647429d1557b67954060eaced3d564747b181bd5b034fce4af96ce004a9e2`
`font_01_sfnt_off0000ed23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED23	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001053a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1053A	10512 bytes
SHA-256: `7c03189342385ff68427f50e4e2a1a6129d3ffe3040ab1aae26301f0346a3939`

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