Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02f546e96f1d68a…

MALICIOUS

PDF

86.5 KB Created: 2021-08-15 08:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47dc593879e871c31230e974b8cec630 SHA-1: 5bd51b7962dd9aaed31bf500e5d87a8740ce190a SHA-256: a02f546e96f1d68a4b5eac41b36326c910b9211bed33ae9dc9f3df4be624cc58
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160827ad45da5b---92771352753.pdf, are likely intended to host further malicious content or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://s8radziejowice-paszkow.pl/userfiles/file/96489101024.pdf In PDF document text
    • http://gphs84.com/clients/866382/File/42644919276.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/91e3693f008cc957a5128ec7e0c58d57/31282043122.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/nirerasogunuberizoxul.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/fufudavomoxutedoze.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8cf4b67fd---wulaginawukexujumalawif.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/29683691306.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/bemamodolefojolitukegi.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/vixigetorogiw.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/88529772551.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f72f1300d---6544568062.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c927e8ff97---xemizupemajebelatelazopu.pdfIn PDF document text
    • https://invest.pl/userfiles/file/lasikoso.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/68218561251.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fojewidaviw.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/bosukowidipegaxijenin.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/42698323254.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/557546d5106a9a5c781015b2718084a2/famijalulejufuxevi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160827ad45da5b---92771352753.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071821143583.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c4d931ad8---malibemejupozirikoluvudir.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/rikoruw.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7964f31eb---fazami.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///rawusufib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=edgenuity+answers+modern+world+historyPDF link annotation
    • 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_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 16672 bytes
SHA-256: ddfff6faf81f63c690f17fd5a911c6cf822ecc9568690494058b643ed70aae1f
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 10976 bytes
SHA-256: e00f8b3839188fe6c37e79ca7b49982dcdb1c1c644c8290e5c24bac50c27e95b

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