Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e18f650ed799b6…

MALICIOUS

PDF

78.3 KB Created: 2021-07-06 04:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31acc441d95c386bec435bfb6a64c75a SHA-1: 878fa11b8de6f3d80d51fa63c1c1d4e162a23273 SHA-256: b7e18f650ed799b6c60363e942bfcb8f3ee5c07eed25ed4f623eb81509268951
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://chatfieldfarms101.com/userimages/38087916134.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/cdf0a08001e8cafb9910a6654abc355c/metaxe.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5fc6958f9c23db55aa5be0568f1d5cd1/jiwunidotugajepudukebe.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609471d164610---gufumisoxepewapizebo.pdf
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/38908950049.pdf
    • http://meadescafe.com/userfiles/file/vujozabonawajuked.pdf
    • https://sharadsangam.org/UserFilesTwo/file/dasanotujen.pdf
    • https://al-farh-iq.com/upload/userfiles/file/goligetono.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/worixasaxetixolafafopodi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2d594f1dd3f82a575e579f7b9d8cfb72/gepobimugib.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a12ff77b710---marukikubisibobogi.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a285f1749ce---lunituzona.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984a14b805a---bojefixedov.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077849027d83---79113488158.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7666281de984e5f9279b75a47cb532c1/korinofopibe.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71368155053.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1badcd85c31b86917939a98fca1a1aa9/niluwubekoratajapekazafos.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c691aec608---95980182939.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cad0607e4dc---kebazupifobasajafalo.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079ead2dc2af---31272821653.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840149cc7e2---damuloni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2nd+puc+history+1st+chapter+notes+in+kannada
    • 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_off0000cc01.bin
62410fcead463943245ebe6cdd801e2e8c1c8ba30f4a53632943bd5728ac7a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC01 10944 bytes
font_01_sfnt_off0000e575.bin
fb634d4ec4a5013d11f2f8e279e16b976c5a166feda1b5b30161400c95cd3bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 17112 bytes
font_02_sfnt_off00011238.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 16792 bytes