Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab40ae1479c82a09…

MALICIOUS

PDF

91.9 KB Created: 2021-07-16 22:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd9271fa972dcf9a1ca1376ba2d59fa SHA-1: 6ef77eb496f0c57102afa8e0d66f5cffe015de0c SHA-256: ab40ae1479c82a09fc2d77d7e078837d1031707c6209f69a09a24cee41cbede5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as phishing or a trojan. The presence of multiple external URIs and the nature of the links suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pmb867ulelilnhob7fu2s22eiq/92082057025.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d6f9ajck5n659qs6veie3helj4/depuf.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aeadbf30ea6---22817588050.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7ddd13b3---16025622905.pdf
    • http://ziconiavip.com/uploadfck/file/25614338289.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7445c521---18034190427.pdf
    • https://defaico.com/d/files/jesozinenudan.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/dca6f131a0e4d3ac2a3aff6d4009003e/41821183088.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/62077493519.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sdo5uo3m0djdtdqandtb2dtb34/66093830257.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa264152be---rilemiwudatojawuzunuxenoj.pdf
    • http://wujipacking.tw/upload/files/74807812889.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8ad08da8---timupenudemotumuropi.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pi9qubvcfdg8h65055l8qcn3l0/49274469339.pdf
    • http://pk.mo/userfiles/file/duzobuxexidovafiwofixin.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/bff35d10944aea6b35aadb7fc4a9e09e/1824641092.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca7165ff70---69008184449.pdf
    • http://vksraja.in/fckeditor/upload/file/bafij.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fded6531---50758329095.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7e03acd7b---10773007136.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2dd28e30a---64551537550.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/19e1f9cec3917ec26131c0eb71ddc65e/firunazuxe.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/segabovapegi.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mtgorl312680m5ii1vnhsvdd46/27513724177.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a0acb35e---8469798251.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=group+2+2019+question+paper+with+answer
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bf.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16092 bytes
font_01_sfnt_off0000ff04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 16792 bytes
font_02_sfnt_off00011716.bin
10ba0f6d237f3bfb251ace927e1ab752f89a6ea1c51c2ff95ea5b4715560457d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 17756 bytes
font_03_sfnt_off000145d3.bin
4705a9905ccffbabd3a559a60514120b047cbf544cc8d723c27070f3f2508a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 11136 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.