PDF malware analysis — malicious · ae765c2399eaad3e

MALICIOUS

PDF

80.0 KB Created: 2021-08-19 01:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ba5ece621a6f3d7db3a2abaa005a08e4 SHA-1: 3a7554ce1acd1cb1c6cb94f5da78ae3a11a6146c SHA-256: ae765c2399eaad3e38f7e69e7b6f6ea8863e1b73308484eaa13d2c26d56140bf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content hosted on various domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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 http://bwlpsalisbury.com/uploads/files/44314488848.pdf In PDF document text
- http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e93128247ec---jegixatilomodakabevavor.pdfIn PDF document text
- http://rustproofingottawa.com/userfiles/file/veremugevatoxoxu.pdfIn PDF document text
- http://kaitosushisb.com/uploads/files/wafarobunufifadilapifem.pdfIn PDF document text
- http://avsa.org/sites/default/files/images/files/mivekabekudejotutoxuso.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/sewefumotavodobobisilu.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160853e6466188---4405953227.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e74c1441---fudevabanirututopo.pdfIn PDF document text
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0ktdfc343cgjpl99rgutomu5ac/8887082624.pdfIn PDF document text
- http://kaizenlife.com/ckfinder/userfiles/files/wavunaxipova.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167ff517f71---7008597371.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6abb2268f6b47d4420399ee0ad632ff5/56624681966.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/97679975391.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/lulereruga.pdfIn PDF document text
- http://funperm.ru/content/file/nevagumus.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d3e7edfe19b34142c27aadc3dac3275a/21509738787.pdfIn PDF document text
- http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d570549fc3b---91826276102.pdfIn PDF document text
- https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609266b95a6ad---kepisiwozetoledolujivotu.pdfIn PDF document text
- http://aaykpn.com/uploads/editor/files/13148766650.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ec0fd89d9---47421610953.pdfIn PDF document text
- https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f6c4d9e57a904ac4270b622159401b0d/73057891806.pdfIn PDF document text
- http://chroscina.com/userfiles/file/xaresit.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/xabupokovatifaw.pdfIn PDF document text
- https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9dda59c02847ba4cc1b83d4671d9ca63/95466304464.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=caterpillar+3412+engine+service+manualPDF link annotation
- 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_off0000d6b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6B2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eec9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEC9	11216 bytes
SHA-256: `c1c575991c670003d58006dcca13df13a6755f2419d2c42ed3e5b6627fcb0e0d`
`font_02_sfnt_off00010930.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10930	15928 bytes
SHA-256: `483d47da84f72ded311116fa142d593eec037f2f48ff9c08368e1b09b0fd5ecb`

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