Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fb7fe186a53c15…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 23:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fc277c85720363447752d9e1ddcb3e0 SHA-1: f103c126a4a8fe39e76e7540d37c616c7716353f SHA-256: 85fb7fe186a53c15c56270a2b4602e813f91472e2551e230564b6988a048d10b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards an attempt to lure users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b884eeaba---56112584132.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084897fbda59---42156379729.pdf
    • https://cardion.dk/gfx/fckimages/file/93613069127.pdf
    • http://monkey-do.net/userfiles/file/89446497340.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab02fb140e---sexowopiwesida.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/32dc94dfdc201d498c60cb097be7094b/suzudovujevigax.pdf
    • https://aterhesseg.com/up_image/file/21406328473.pdf
    • http://brianhaymore.com/images/e/file/nosekimato.pdf
    • http://janandpoos.com/clients/872640/File/gutipazinewogabaseriwenu.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b790b340976---desisekubuxofon.pdf
    • https://pacie.vn/web/uploads/files/3315059927.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6dd726cdd---36366549891.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc08f784f4---97569566751.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b4be64fd---visivawemewofuxebijurisug.pdf
    • http://csptech.net/admin/userfiles/file/4030545386.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5t7so4j8hu0k8j83ki2lsmf14n/58798136115.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dd1491d25f52d5cbbac11e4e89ac58da/zemovadiludawejuderifata.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/dc2f92cce96cf94eebb7590e91af5faa/46985556981.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5b36403d001997541068342bdaca9e09/70648190215.pdf
    • http://rajskiewakacje.pl/userfiles/file/84462281562.pdf
    • http://tzoetemondje.be/uploads/files/16083770114.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e7kp30h8sld31f3nde3dbd37pk/43682154399.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dr+dolittle+box+office
    • 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_off0000f494.bin
a7b9ca8803aa84042e7e0454fe7c9dac66d985ce880d8dabfd2da5a543675691
pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 10280 bytes
font_01_sfnt_off00010bbf.bin
10a8f79edc16a2ce647eb8d2d81601c7c1ff0a9a9dbeb79cfb5eae4691534cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 17472 bytes
font_02_sfnt_off0001394e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394E 16792 bytes