Malicious PDF — malware analysis report

Static analysis result for SHA-256 1483d1a6e10fd9a1…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 16:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 924be3aa8fada3b4d1a2759daff5405c SHA-1: 39fc71d6d0706781f6f06e796127ac5bc95bebd7 SHA-256: 1483d1a6e10fd9a1eb3830cc9756d41da1d57b84314654af9f5accdf1a968b07
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://jcon-aps.dk/userfiles/file/84653303267.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/81e266e1a716b3957c4832da4661014a/33807691259.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/41447740818.pdf
    • https://tch.lu/files/files/89195652732.pdf
    • http://etalentlink.com/uploadfile/file///2021081804213093.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fbc77c1d3---batipugaxibitumalukedoruk.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/5584e27050d3a54e947c272fc9e3a677/56306359301.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0a383e540aae5e45ba4da7d368adfc47/19285028317.pdf
    • http://beergolfers.com./blog/images/file/tefinubovapojamagexizuw.pdf
    • http://longthinhphat.net/uploads/files/29554394392.pdf
    • http://www.derbysignandgraphics.com/uploads/file/18557780098.pdf
    • http://www.uc-kushiro.net/images/library//File/59519165091.pdf
    • http://tbm-mova.by/images_from_html_editor/file/kewadokadokofopuparawuj.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/kizaxatezodexigowiminodo.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/48925160680.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079203c5f24b---tenojobiza.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6unhp1jdeimee5ld0qd2fnh9m1/lopegalimagisubasajap.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c07482a824854ddffefb431c84cee884/53947621022.pdf
    • http://hykylalumni.org/userfiles/925084380.pdf
    • https://associazionedynamica.it/uploads/file/14247921425.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160874c1872862---65716452336.pdf
    • https://micsys.in/userfiles/file/vasimujawuzevagi.pdf
    • http://fogathajtohirek.hu/fckfiles/file/wirum.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0ridlekahc0i6q24i3pij6pq62/70553945415.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788248aef3f---6539702690.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=suffixes+y+and+ous+worksheets
    • 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_off0000b3a8.bin
e6be6199cb9c748c51e1f0862ceb684ed2dcab70c88810d823c2c2b9b171b2e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 10972 bytes
font_01_sfnt_off0000cd2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 16792 bytes
font_02_sfnt_off0000e53f.bin
113ce1740372f0296c923eb20f06a6c2ed18014bffddf4c5586836a647ed1f33
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 14804 bytes