Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8b1643782e225d…

MALICIOUS

PDF

92.3 KB Created: 2021-07-10 04:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30fb2c118fdd50d107359f6a0f61acd5 SHA-1: 2c9b9a43e118eee2f54d259f6d443f295ad42cc3 SHA-256: 1a8b1643782e225dcddb24bc4708cbe8e022532aa9730c6149e472431aed7084
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely serves a malicious purpose. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links and the nature of the hosting indicate an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.aluvascientific.com/UserFiles/file/9018377334.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/ffa4cf41e45347a5534d88a3c90f7c73/83175104232.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/10670893484.pdf
    • http://maility.pl/_ADRESuserfiles/file/26786389723.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078722e0ad25---62068840215.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a9946e0195173b504528fc9390000a27/jiwufasakeluwop.pdf
    • http://merwepizza.com/upload/file/53868029528.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5fae5ae0---5993102668.pdf
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/kezotuderirumazimome.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5bcb42e57---tidunujugazipixuxuk.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a7fa3838---65548071413.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/31cbbe5c53a22502e8ac4216169aca67/ziderazeji.pdf
    • http://gancza.pl/userfiles/file/befapekixekesoni.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/dusil.pdf
    • https://curryleafharleysvillepa.com/hang/userfiles/files/sikoxigowugiwejufod.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/eo7p08t34devjtlf7d173uut48/nawapigirejivelunijexiv.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba61c5cb13---5632719574.pdf
    • https://navliecky.net/userfiles/file/62595303939.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec4ac62ff---dorazelaxafed.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a922f5e2529a1284e8ac27ffec05fbb7/faxuz.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2fa03e2d---87744851921.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/201e6b7094271df3bef27e1b4e0d2ac0/31913888831.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4967434365b0e1b963cb9bf2e86b4594/58317276866.pdf
    • https://atesolve.com/ckfinder/userfiles/files/kusowofaladugubirapug.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/zarovalebupigu.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76864c2ef3e637d36095a9ae9c20de90/49876094386.pdf
    • http://skogsformedling.se/bilder_umeny/File/85051925982.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+girl+fall+for+you+on+chat
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d0.bin
b39a3274e50dce5fe5233e382c43220ae9af450919b48f697d990490ba588453
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 11000 bytes
font_01_sfnt_off00011e2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 16792 bytes
font_02_sfnt_off00013641.bin
0f3d93171d1b525c5b9499a7ae940547ab0fdd23af8990661db3feedea65cd22
pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 17412 bytes