Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3cd0e03b838755…

MALICIOUS

PDF

84.2 KB Created: 2021-07-05 16:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bf68fce9b12f903812e44b228c81d922 SHA-1: 4accc797f625ead572e9c75bb2626a94c7f38dd3 SHA-256: 2f3cd0e03b8387550049e89740dd53bde56d46a4fddfedd9163702575f3e8f17
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d286871d942---luwudatudof.pdf In PDF document text
    • http://gmkms.net/upfile_editor/2021/files/sapatazetiji.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f80eb3f1a9e0cd39b57c222ebab5e8eb/51564329959.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/vuwetegiwezefime.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/94126247944.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ace41b602d4---92289327690.pdfIn PDF document text
    • https://mfdesign.hu/files/file/55848146881.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/8acd9a0427e3a8eabce21bff8e3c9660/90519382238.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/41370259024.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qmj7m3p7fggqae31704r7d5o8g/vaxejilebavigelonoravafu.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/darelopowibo.pdfPDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608944de1631d---64560101186.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820493b3611---90045931737.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/64193559625.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bumimelowovonabapaxa.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/durulepawateperajenepe.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/31844657162.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210509/file/mejenufadowowunuleka.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kavemidi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebfcaa6fa8---gepegozemidatejatunawefos.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098c34f0ffd4---runujagujejavuga.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9ph2vg5tjkpd3fi0utk8scfdb6/87015337402.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/vepefotezafubebajoril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=who+is+ares+married+toPDF 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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 10356 bytes
SHA-256: 76beb94f98f4983f9bb2f1ef8de3169815327df6a2089ca1f70596f5462aefe2
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 17176 bytes
SHA-256: f4092ffc2b905c17647b6eeef85d0ede279c4debd993a74ecfb17742f291b8dc
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1