Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa670d11c70dfdb4…

MALICIOUS

PDF

74.9 KB Created: 2021-08-22 02:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e3b02528b4f9308e2939aab224eaa1a SHA-1: e57693a60cec970b1f0d32028850d46e265b959c SHA-256: aa670d11c70dfdb44cda178388392b719bf83147bf242826af60032ce04be363
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which are hosted on compromised WordPress installations. The presence of these links suggests the document is designed to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=watch+mr+and+mrs+smith+free+online PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160818d3606401---xukeluxasazidebapu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vgut4ma0v3fgj7e5fipciasc68/fulusu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c8adf0832---mukusuxupanowe.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5c585695---zimusibaridiliretofatuva.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3f50k17rtpq2ss6n00r3an1cl4/37698444086.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35531043636.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/41208251058.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/98287088478.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210628025839.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160934d3a683e3---fozefikipone.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d24cff745a5---61607247928.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/jaresizolulemadijigejex.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/7489817237.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/42433150987.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e658221fb7f99a6a12e7bfa964a3f4d6/nuxolelesalejimosuwogo.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/21754531552.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bd02d346---20303612525.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/41777841088.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210802102428.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2df007c84a8655d9d113dc8201c0974e/fowosimoxoveli.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/verunosa.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91577ad368---momisasunuxola.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/09686db8df524cf72172b31c857c6160/95556957686.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE4 17660 bytes
SHA-256: 8ca0c40d7d5d95285d4c3b2cb663644e524da8ed12ccd2b5ddc8b07525e38cba
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10732 bytes
SHA-256: 918a1895a1f2246f5e9a5c21466d483b164d0a16c0af32965b4c17be218fe490