Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5517dc3c99d965…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 14:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2dee2e154ec69ced511b6748a97555b8 SHA-1: eb4d3f3fb62ee1391c576b75cfbc28d40e982e72 SHA-256: 3e5517dc3c99d9653cadc5234e2769c85dd43dda045a56094937e74c395b881d
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts and a link farm pattern suggests an intent to redirect users to malicious content. No scripts were extracted, so the primary attack vector appears to be social engineering through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://atthaya.com/file_media/file_image/file/20940182373.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093365004620---32224169589.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b799c7f9bf---39557982799.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4555eaac9---volusiwi.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06f39f996---sekukumepafes.pdf
    • http://baggiez.net/userfiles/file/xojerodeno.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4cfc7893---robeketifomipawosabosiku.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/fimozogebanare.pdf
    • http://petra-dario.info/upload/datoteke/kakarolezipakurodaje.pdf
    • https://atraba-holding.com/userfiles/file/rimadefimex.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c5f42adde---10504888135.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/41vk8k5vurp9fgrilaouer7kau/redotiluz.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7ekj26l2h1ts18k9lu69ihart5/zigavavozubabowabivewadaf.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d87f1971---29256671229.pdf
    • https://medsplus.us/admin/images/file/16541722673.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbffbc83e---5797169193.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/dpn61d2ge44hiaoourmncqe0re/taxevumiludiluto.pdf
    • https://artenika.pl/fck/file/65776095936.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608507c76adf8---54956612222.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607a709ac3d05---lagirazedu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t0oibe9nsk00bkiru4el08h5dt/70413612424.pdf
    • http://lucann.com/Upload/file/13255013059.pdf
    • https://searchlink.org/userfiles//file/kegobuxowigativunaditedu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hand+washing+five+moments
    • 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_off0000f0dd.bin
c76039732f723ebb28efc581637fa95f324b3417f269b7af0bd08a70133b44fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 17208 bytes
font_01_sfnt_off00011dbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 16792 bytes
font_02_sfnt_off000135d5.bin
76fd388b987ce77252c96dee446cf2ed2f42aad01b59ddc217c20ca3c491ae5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 10796 bytes