Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8ce9841f04fe24…

MALICIOUS

PDF

77.5 KB Created: 2021-07-29 20:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75088dd4cbeefea2fd7c83d6856526b5 SHA-1: efc3b247fc8859c3c3957d52b5eda3dce27ff594 SHA-256: 1a8ce9841f04fe24f8dd81f42695f8e15b4df2a4c4d0bf76ac05b9cbd2c7e83d
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to compromised WordPress upload directories. While no scripts were extracted, the structure suggests it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2a8ade22e127463bd27f4c76d2f51839/kosijivepusif.pdf In PDF document text
    • http://iwaandccareunion.com/clients/57137/File/44941745859.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d837d3066b00fee8ce703ffe1ccf5cf4/zolobobereliretadamuwef.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/93868674752.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/gopiba.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd03c339b8---poveguzawuwa.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e0d9c252---37509812180.pdfIn PDF document text
    • https://12shio3.com/contents//files/gekesux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19252327b7---kusebakaxunitapefuji.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/17027635178.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094deb2244e0---balowuzenabigirevo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zobexasaparekibafe.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dc5c5453b---32413108335.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/fudug.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/dd3db48909c372ce7ee970b1c06751b7/51711929687.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421b92cf8c---85916593562.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/032a5e427450cbe425fadfae4206a5de/62430658350.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d7e78907---xugojipodeninisij.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c95487411---fuzob.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/28387607066.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/jobugabupekawuxoxul.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbbb3ac946---sunikitifukevat.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb05e26b7---sekixukixutalexafule.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc3024ef6---31348458282.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9f0264d52168afd76f31cfa4be5e6d96/74042791629.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/fefiwes.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/ridisorukowodatiwikit.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/10289910422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sri+suktam+pdf+downloadPDF 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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 17092 bytes
SHA-256: 2109a9ebc195b65c94c29a1c99f9fcfb51ad8e433b00ee142f131b123e7197f0
font_02_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 10880 bytes
SHA-256: 625b8a520364ff7f1c6bf8dfdde7515e8da4a47624e8a08096a0cebd39de9ae5

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