PDF malware analysis — malicious · 7c8b8c84d03d0cc3

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 22:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 40397a5b7f7dd96d47a05ebfcd57e2c4 SHA-1: 1c7bf30edc8977cbd9e867cc18f41e26afb95bae SHA-256: 7c8b8c84d03d0cc313ba1f1c16cde21948d96e7b565ab1fa0ed54259692a4d53

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on compromised CMS uploads and a lure for a password-protected archive. The PDF itself contains obfuscated content, but the presence of external URI heuristics and the 'SE_PASSWORD_ARCHIVE_LURE' firing strongly suggest it's designed to trick the user into downloading and decrypting a secondary payload. No scripts were extracted, but the overall pattern points to a phishing or downloader attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e5da76107a89870b0f88509a4baf7b4a/94907680110.pdf In PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c0fb7217f---fogonumobuwuvu.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788c1eb35dd---totuzapadagajoxomo.pdfIn PDF document text
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7c57e5857ec709be44b4e4dae557e15c/kafopibebigakuvan.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b1daa1cd1---3411547349.pdfIn PDF document text
- https://shreenathtechnologies.com/userfiles/file/79667630982.pdfIn PDF document text
- https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4f0b454d8838f72d35c22e2e119b79c4/15924853962.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9ac86638.pdfIn PDF document text
- https://shopabrang.com/images/files/lidafawazutagidi.pdfIn PDF document text
- http://toyotaquangninh.org/data/dulieu/files/9953968870.pdfIn PDF document text
- http://dinskayarealty.ru/media/file/rovapaki.pdfIn PDF document text
- http://micronforgacsolo.hu/UserFiles/file/48258383156.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/efdcf2b2addf42b57073c6b57ad8154c/78546244010.pdfIn PDF document text
- http://romanakladatelstvi.cz/userfiles/file/84752676631.pdfIn PDF document text
- http://abwlargo.com/uploads/files/89038748946.pdfIn PDF document text
- http://euredit-editions.com/userfiles/file/55766060807.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4069f60491---88549789761.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7s1bhjn9n3sc5lbisssk4gplp7/xijub.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d460dd89c6---41206228022.pdfIn PDF document text
- https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4e587b68796b69a1da148ab90d88180c/bulazupuma.pdfIn PDF document text
- http://esipro.lu/userfiles/file/xavobodinun.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793e6fe8ce4---4307519824.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/245afbc99d692a022f57ebb943690381/36973890803.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=about+unix+operating+system+pdfPDF link annotation
- http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4f6bb9ebde0518d582247590fd8e337f/lavivagesunixivenu.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_off0000e753.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE753	11232 bytes
SHA-256: `e904523ae61088b874f3c1669474b6b3adb12a1f86da0247e21228768de6ef91`
`font_01_sfnt_off00010153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10153	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011965.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11965	17024 bytes
SHA-256: `774b2dd24df117914f97d2045860fc3f5e7a22f4365f3782d74b73e97eb466cd`

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