PDF malware analysis — malicious · 421b22e8faa96476

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 01:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: fcfac9531ca7c5fc1dd49ffd697c139e SHA-1: 22b85aa26c6ee033876337a78f7b1f5cf948dd0e SHA-256: 421b22e8faa964767d9add56b8fe39626bfa32ae7dc6d706e2065694cf8f685c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=what+is+depository+name+on+direct+deposit+form PDF link annotation
- http://lenosada.sk/editor_uploads/files/81849813861.pdfIn PDF document text
- http://wcsps.com.tw/ckfinder/userfiles/files/61153294344.pdfIn PDF document text
- http://better-pharma.com/images/file/files/tupewifi.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e644d590a14---bawuriranotosaxovipomasu.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d939168ebd---jonutasuxoniwexiro.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6626daa0---49662097585.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0d6bf34ec7b05c3091487b399c5542af/fojaresimen.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d75afdd64c426adcc2f885a320eb0ca7/jutabonaroboweri.pdfIn PDF document text
- https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbce5e075f---27482096444.pdfIn PDF document text
- https://keluargamimpi2.com/contents//files/vugirapupilijudejidenax.pdfIn PDF document text
- http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b5256a9b503---22882628958.pdfIn PDF document text
- https://nnt52.ru/userfiles/file/94036443306.pdfIn PDF document text
- http://fosterfreezesantarosa.com/uploads/files/safepope.pdfIn PDF document text
- http://thuonghieutoancau.vn/uploads/files/12590451351.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be495df1124---gemixelejalipokuzakaginu.pdfIn PDF document text
- http://timapools.com/uploads/files/15784056597.pdfIn PDF document text
- http://prefinancovaniehypoteky.sk/res/file/28294452892.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b87125ae8---ronujarizok.pdfIn PDF document text
- https://studiovizia.com/webroot/img/content/files/timijesimo.pdfIn PDF document text
- https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/141eeg2sk1g74u6nfeov9anmdp/bobel.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7877497cfd---bugopujibeporubasedixujap.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/86dc6ce7586178207a0ef2d3c7aaf32a/juneralonugelo.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/49cecf706451b3b563c62f4dddfd3796/sexoteruxewirawije.pdfIn PDF document text
- https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/hdq3hf9ou7721j9b1rqi18ro31/94573553049.pdfIn PDF document text
- http://myqself.com/upload/files/fiwexeti.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_off0000bb0c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB0C	10948 bytes
SHA-256: `922d8d817a900d8e4402847a87885358d22ac1b00aba04e808be1971888b3690`
`font_01_sfnt_off0000d447.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD447	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ec59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC59	15116 bytes
SHA-256: `0d1f47741f9b0c2afb08c31def0c31ce0ee5f4744686bb516b68ad51c5d5a0cd`

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