Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e3198786ffbaa3…

MALICIOUS

PDF

79.9 KB Created: 2021-07-03 11:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30d2c4c4d4b21a70a2c2b14c7188f593 SHA-1: da7a1ec4cad4acc5ede11a5add385457d88560b2 SHA-256: 51e3198786ffbaa3845ab8a656cbef29d170ee38fa99dc2e90bf2aac82cc28c8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of multiple links to compromised WordPress upload directories and disposable hosting reinforces the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=speed+time+graph+worksheet
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/10574490fb3aa1ff1054314e077e5db7/vajibofebizeburitobix.pdf
    • http://markone-tools.com/upload/files/42602552975.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8cb670d5fb047a8758e68657593e61e9/limuweb.pdf
    • http://karunb.com/UpLoads/files/77798284809.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/b9825463e3f7b8e5437d5a40b030bf6d/85051079292.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/f617fdb316142465c8c466f4975654a9/96643903352.pdf
    • http://ventilatoryzlin.cz/images/file/fupigusaluxawa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f58c811209---56540306123.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cfo723fhk90mn3tp6so4p3r864/xinifedemonemor.pdf
    • http://pantryscan.com/123cars/imagefck/file/wuxififufol.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/70b91b1b4f21e56916c86c12047d12d0/xozutavavifonatezokipen.pdf
    • https://ngusacdon.com/upload/files/logageviriferu.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3342e4c730---maxonuwazalonaxaxurojej.pdf
    • https://producedepot.us/userfiles/files/49788317936.pdf
    • http://turatabor.hu/media/jeriwaxidobilega.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c340ebca59d---41257095301.pdf
    • https://foodphotoshop.com/userfiles/files/76785806668.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vhbatv2eho4ip2phbbjjl3jvd1/69413501205.pdf
    • http://msiutilities.biz/documents/82534714895.pdf
    • http://lorichphoto.com/pictures/file/95018367285.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ijdme6pkgt9blacfkkb5obrr32/zedixoteborivijid.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/tomeluwonukemenixej.pdf
    • 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_off0000d2c1.bin
1a40e50ad1c4caced7fe5a0cbb5fe12b14c36c85b2be9346696b96cca269368f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 17736 bytes
font_01_sfnt_off0001010f.bin
7ec594804a92cda037a306189f2fd1a317d24629bc6df3fd97fc3f1ff228ab77
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 10940 bytes
font_02_sfnt_off00011a4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes