PDF malware analysis — malicious · 8aad8b3d64cfc5f7

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 13:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 162de6367e31903dcab10cd012e6bb67 SHA-1: 57ab98b0c1ec4317b0e41f5702014961ab344679 SHA-256: 8aad8b3d64cfc5f72bbb7e678dcde0dc87ae7804245ff30661f7630d8c239009

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search results for malicious purposes. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

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://allytemp.ru/uplcv?utm_term=english+guide+for+class+11+pdf+download PDF link annotation
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5e2792a60034352a61e65cf74d3cc9c9/97199302620.pdfIn PDF document text
- http://thuduchouse.vn/pics/file/zujufekajomenufud.pdfIn PDF document text
- http://debeight.net/UserFiles/File/mikit.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4701392ae4---81498042194.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/27a4ada5d5843a17924ecf0a99c69f85/38905153472.pdfIn PDF document text
- http://olgapolyakova.com/files/files/31888185861.pdfIn PDF document text
- http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/66170626687.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6orr4u2vo6vjq7nmsb4mqs4291/muradinejevazejado.pdfIn PDF document text
- https://binarbaidtrading.com/public_html/userfiles/file/sopatoxub.pdfIn PDF document text
- http://palaciodelosnavas.com/userfiles/file/74564040696.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1db423269---11883461174.pdfIn PDF document text
- http://cu-mbc.com/ckfinder/userfiles/files/44759727650.pdfIn PDF document text
- https://papiratisk.cz/soubory/22700401353.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b475b49ac63---gijanimikabagizaxodu.pdfIn PDF document text
- http://espressoperfetto.nl/app/webroot/files/userfiles/files/37917455190.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1a4560316566bb96d1f758b065ad7397/58428928661.pdfIn PDF document text
- http://xinxinhouseware.com/uploadfile/files/xiwopaxomodinenebemomozu.pdfIn PDF document text
- http://dtyxbpzx.com/filespath/files/20210831163435.pdfIn PDF document text
- https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e9437d8a526005b210a5666f8daacb70/zavugixomezuti.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2ae85cf1---28749020415.pdfIn PDF document text
- http://ingenermarket.ru/userfiles/xujonubulolasenuwafokireb.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9134914682---21235187112.pdfIn PDF document text
- http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074110abef4f---waduvisoxizonug.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7ee7eb0f0aaa7eec458659a935c203b1/46939781289.pdfIn PDF document text
- https://takitech.hu/userfiles/file/jatopobud.pdfIn PDF document text
- http://onnetsolution.in/userfiles/file/91071752084.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_off0000d2bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eace.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEACE	18248 bytes
SHA-256: `a6328f3fd32422a91d5170f890f37cbf6d9842a6fc33dc63c63042f44dbba84c`
`font_02_sfnt_off00011a0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A0F	11024 bytes
SHA-256: `bb1f9e0aef41eaabb5723f1ca082e8f465b96d64a05fe06bff646a03772151dd`

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