Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9d372801a06069…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 10:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ba20a3cc778e3501aeb45e05f7b4b58 SHA-1: bea2756f1ca30f7c54af5dc71ac2569f9ad74b6a SHA-256: 3b9d372801a060692785294bcf54b9cf7aaab8f8587186bc468e47227c143451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple external URLs, many of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware download sites. The presence of numerous links on disposable hosting and compromised CMS uploads suggests a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.chp.pl/ckfinder/userfiles/files/turuki.pdf In PDF document text
    • https://bestofbucerias.com/upload/file/sojedigitiw.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210530121627.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/pedadoninifalupuxede.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/98336899178.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7c8e249afecb7eebc031a8b2f787e2de/tojugudale.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094507bcd117---lasuvusevufebubegotobozag.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/7e8feb4288877dd367eaa71a357ae88b/34179373747.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210620031404.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4lv1dhj33u7532lrs4i7fq6vni/93272883268.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c415c85c3---riteluxajakimodem.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/78629034002.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/62901380960.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cbb56ee06---wututegoxisomiduj.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/78095546827.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e688d4cd0c---sojisuwuzijijufej.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/gogalamalogipefobusezuf.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813acd2476b---bodusemudeledik.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/10135931911.pdfIn PDF document text
    • http://com123.vn/uploads/file/sufobofubanij.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/86123994973.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5d15536c---gekepuxuzaxesivepigo.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/34590703810.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac00a6c874b---famurorusesobokusa.pdfIn PDF document text
    • http://anupbolivia.com/images/files/mogumex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+iodination+of+acetone+lab+answersPDF 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_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 10764 bytes
SHA-256: ff33e59d9dfb2b19d12a5902add9c8c4da3bcce35230eaa36fddad7d5d0ca18c
font_01_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16732 bytes
SHA-256: a67db2b64eea0dbee0d4c49984c3ff57fabf8a626b5e55dbcda09fd9ee65bce1

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