PDF malware analysis — malicious · 7b40774b95a6e493

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 04:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: da3c7adecb2e7d86a1b349171396a6ab SHA-1: 82f0a73033862d7690f301792ada5d76fafac777 SHA-256: 7b40774b95a6e4936b241c3ce111b644ebaffbf55cd4089f37fe93d4235bfd76

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a phishing or malware distribution site.

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://irlanc.ru/uplcv?utm_term=types+of+defense+mechanisms+pdf PDF link annotation
- http://banhangcongnghe.com/upload/FCK/file/dopifuvafotawofavelasegoz.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/eaeb03eb2290d6bf90b4dd86dc4ab307/wazewadebimunebamefa.pdfIn PDF document text
- http://hoangduy.vn/vn/files/sofuvawawiluwifuwuxoxobo.pdfIn PDF document text
- http://ontis.sk/editor_uploads/system/files/filivusovadik.pdfIn PDF document text
- http://detskypohar.cz/upload/file/46767237590.pdfIn PDF document text
- https://akanaymatbaa.com/calisma2/files/uploads/mutapukam.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a97757743bb---79068747289.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c043bc107cb2ea5684406a4e720bb1c0/67641535082.pdfIn PDF document text
- https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/92e3c008fb929a67c9032c419da2ca03/nojevubuxowoxewote.pdfIn PDF document text
- https://valerart.com/ckfinder/userfiles/files/581126954.pdfIn PDF document text
- https://maydangson.com/vietkiendo/upload/file/waxoxoxivitu.pdfIn PDF document text
- http://www.toeterloeh44.de/files/rivubu.pdfIn PDF document text
- http://qamsar.org/userfiles/files/tibegomuwadusuwurewejinof.pdfIn PDF document text
- http://korytnica.net/data/files/26828193398.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079be8d698ea---tanuzumil.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5fd12e0eca2f374d66a517c615f58427/45604724606.pdfIn PDF document text
- http://jungam21.com/upfiles/file/1627588252.pdfIn PDF document text
- https://ive-cal.it/file/nixikurazululorodelitunum.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a5eab601---56038019768.pdfIn PDF document text
- http://goddesshair.net/upload/users/files/61657260471.pdfIn PDF document text
- http://megat.pl/uploaded/fck_files/file/39101406230.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab09bc7b1---9454235048.pdfIn PDF document text
- http://geose.ru/userfiles/file/9978821206.pdfIn PDF document text
- https://clubesolbra.com/uploads/files/88275331552.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d687.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD687	10720 bytes
SHA-256: `6b43b37bf990383f4cbdab3eaebc5cb68682c689115e913eec9d6f627b16dcca`
`font_01_sfnt_off0000eef5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEF5	17996 bytes
SHA-256: `b31d6bce2c6717546fe02be4850e615035e3c74f83e1ccbcbc591f365adbb07b`
`font_02_sfnt_off00010abc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ABC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000122ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122CE	16972 bytes
SHA-256: `da450df416009f4285eb7984c464a240f7c2156a7d24c1694d5beff4e47c9e82`

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