Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ffd51c396a7eed…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 18:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9605459f76ab5f767ca61fd5fa745645 SHA-1: 1853113a64dbfcf3f793fb92e203c041f66d0493 SHA-256: 04ffd51c396a7eed89d4e0ffc41040f67a501a7683a36e686a2e56e76daae944
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 ML classifiers and ClamAV, indicating it likely serves as a phishing or malicious content delivery mechanism. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://bandotrading.com/uploads/file/komuzimegetexew.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7cdff6e11a95463e14f1aa53b35257d/piwekegitijubiwavelejopi.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/58981337062.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/22019966563.pdf
    • http://allmedicus.com/userfiles/file/70721782232.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rsa0634nv28r67sb16t5fmsg9k/koberobibolepewojatar.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a6ba7323ba9393004380539637f20302/lowizevaletusurilob.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/aca41926b09150ad23f1a0cc9c87315e/70858452124.pdf
    • https://secolink.sk/userfiles/file/56109864900.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa8a14272---baxoz.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-15/20210515101150487831.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23a13aaf2---8610652524.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7254cfdad---xopovakonoj.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/pukaw.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c702d85f79---vukorinowapumagukukedoxu.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0f022ae1---43974137442.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0046fd21327759be94581c9a8ac47771/lafupinudapozudawiso.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2ce11a3e---zizagilezibe.pdf
    • http://guchenes.com/d/files/56164447639.pdf
    • http://kaitosushisb.com/uploads/files/56792639619.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f2a73b01---zezepivotopireva.pdf
    • https://al-farh-iq.com/upload/userfiles/file/dufar.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/rarizumakomofoso.pdf
    • https://bustotoronto.com/userfiles/file/3243010585.pdf
    • http://gpszone.hu/upload/userfiles/file/refuzukijudifogig.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ea39769b19d1f6362e1b4f6e754e72af/53765711659.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=humpty+dumpty+with+action
    • 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_off0000f921.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16792 bytes
font_01_sfnt_off00011138.bin
79064aae9ae6247c84148f733ff7152c74de546564d16f0f0df97bfa2037e9d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 10624 bytes
font_02_sfnt_off00012957.bin
351800d18d0b391f01481f3b7d9ed8085d90fd1362967a16d17c873540dc6ff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 17152 bytes