Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9557c2ec4ac8971…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 19:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fae6cb119486e46a9d5f9c2b21b3ae1 SHA-1: ce278ba2b9522c60d2ef66177f40ab1e3722b674 SHA-256: b9557c2ec4ac897139128ad6b14e5c36a868afde724f0f5d5a27b2f805f80217
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting the PDF itself. This suggests an attempt to lure users through deceptive content or phishing, with the ultimate goal of redirecting them to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/87e5d89dd829c0777979636211c895dc/pubuduzuwinozurakuxojuweg.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b32b346f151---masafa.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9220ce00---vogipigane.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ce60b050ac8---sogenikuxoz.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b6065420---55857042826.pdf
    • http://kasintorn.com/images/upload/files/judaxefepipuxapezunisomal.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fc0a2694de8d64d432171e4e922e7291/lewedemibebeto.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160914237e7861---66059248386.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609442727fe2f---69119173401.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/368c86a5bfdeb5307e69f065e956f334/46661551393.pdf
    • http://emaaravm.net/upload/files/54279194732.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b0bdc8d1---67407486900.pdf
    • http://kasargod.net/uploads/file/6389167501.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b22227fa---75068603256.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986afec88e2---33812977426.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d643577cd3---92339456402.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b35e3cf4c---tiluwawanata.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d7bbf716---babopalu.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4325717ece---29627850322.pdf
    • http://sincaremedicaltour.com/js/upload/nifeki.pdf
    • http://aucoindeshalles.com/menu/file/sajefilazanowet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=world%27s+biggest+rainbow+trout
    • 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_off0000e867.bin
537148db8f39e0ef3a69d13cf979214b611e7b7ffef61addeab44b661d3821b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 17280 bytes
font_01_sfnt_off000115bb.bin
f681b05cd98ba57c72ec094d3d2a232ab4c20b6ecd0b4a9f956fa4323f1794fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 10776 bytes
font_02_sfnt_off00012e90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 16792 bytes