Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a167bfe0322dfd…

MALICIOUS

PDF

96.5 KB Created: 2021-08-03 11:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fa42d7fa254ca15c30a1a0904d1712fc SHA-1: 24faa13b1f1244ebebe3e7de0dff1c5e5fa432ab SHA-256: 83a167bfe0322dfd826a8b2c712d0a4cc66bc3161b62b34c0a602b0b27c829c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm hosted on compromised WordPress sites to direct users to potentially malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt or access a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of PDF_URI and embedded URLs suggests an attempt to redirect the user to external resources, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=how+to+reset+bios+password+hp+elitebook+840+g3 PDF link annotation
    • http://cngwalk.com/fckeditor/userfiles/image/tireboj.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf558426c48---92758926394.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174b1ad6fd---tapidewofomuzitexefozal.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/44890098309.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/46632528327.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d97d596d9ed08c3261a43c4ec632da5e/47435938420.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/al5ghjg03a35dm7f6mjirhokut/sabip.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/876086cd0475aaef5c7f195f53362eb4/5954171216.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/74971755117.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78190431508.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4a469144aec55336cae88655e6d48105/48488061142.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/rowobolumewaruxugixiwu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4b6b9aab2c1c8dde16a85e877fde043d/xuramafipuxog.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/511687981.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/86974835146.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f15d0nqbs4feri0gg0jvrikhc6/65224559169.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/sobirepe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dbf24d93---xosus.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/davodovimu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77e8a4a88---sasokatakesodedikitebewo.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/pulojumavobavox.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65c708bce---pujegumolu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8c6cabd41f06cbb3f721c4ab99ea40fa/63989959361.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dda9080b1---kugusasu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b595648e07f22bcd88bd3b9ed60caf83/48186978064.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a07dfb99a5310d618795ca54441231a/wozadoximadijomag.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 11456 bytes
SHA-256: eca74103be579aaed1cd6c4aa7e709e8a029e2bf1ff43175eb2f8ceacddffdf3
font_02_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 17348 bytes
SHA-256: 6dff1ae54e161ef3a8b73b4f9f065dbc6bb91b620c8f968335f33eff61fa561b
font_03_sfnt_off00015aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA1 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d

Open this report in the interactive analyzer, or submit your own file for analysis.