Malicious PDF — malware analysis report

Static analysis result for SHA-256 892f80a3cf7c3d3d…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 21:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ebb066934f0dbf5020ba4e22e8628ba SHA-1: c9631c355227dba661db193968c7646515b3de70 SHA-256: 892f80a3cf7c3d3d9c607de0fc39613faddc7545f50034f7d4eeb2a785b71dbc
96 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, indicating a link farm or SEO spamming activity. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4563fbfc4c---jinovakefuxoromumow.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/77t08sknvgrb91h63su9jr9nk2/jagoziwumapolotajavoni.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/giwax.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/40889147953.pdfIn PDF document text
    • https://migger.dk/userimages/file/80929211623.pdfIn PDF document text
    • http://www.celso.org/download/68350822934.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee91bc02de---60275266447.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d878e26f820---96628528927.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7007aae4c---bimafulumeba.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/19ea8ae671ccdc83468ed2a07388c58b/92987093390.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210613_BEED8A2EA43F803A.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dec3ed985---90045642508.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/d6vhk7q6iqutpbt3k4qsja3ofk/84669853030.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/33ce47d3031eeddab80d4d441e35bfd7/51023726263.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/munutepavemufaj.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef831b1b7---43507833909.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1635b4fff0aeefa3a42f336c4642117b/31473342038.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0dc943f759c3e0200f16ccff25d5330b/tesaromol.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210527055616_2026347726.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/21540169073.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/v3jhhdpevs8jbbu3lu687as2ha/risesivojimemivisew.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b7facf06fac0cabd0a44d4f3a7c04380/23847757470.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/rivozofifabikiwifonive.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xeladofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=solution+of+higher+engineering+mathematics+by+bs+grewal+pdfPDF link annotation
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 11580 bytes
SHA-256: dc480a44f5c2bfb9438804890213a24a455218e22717209785ed7084b64ef1f1
font_02_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 16876 bytes
SHA-256: 20477caa5246192fdf211c374f3106fee769e99c8d2849f2ad6822491fb39ff7