Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09cb0fd6c00a7b5…

MALICIOUS

PDF

86.1 KB Created: 2021-08-14 15:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 912beb2c0efc0c50aa72e3b4f7dacf47 SHA-1: ff89aa5940f7839320c6fa094d57f6a02871a36c SHA-256: b09cb0fd6c00a7b5e69346bca8ab3003ade9c59836ef9ff696c32eaa8f2a9f5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=que+no+puedes+comer+con+piedras+en+la+vesicula
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf526322f0---40338445924.pdf
    • http://jarosi.hu/files/file/lijetizi.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/371f90dea179e26887fc0ba06eca2e63/nasogodemawufijebexo.pdf
    • https://motodubai.com/uploaded_images/files/wifefa.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/18864838512.pdf
    • http://esoftland.com/userfiles/file/28629327509.pdf
    • http://stevis.cz/files/file/kufewurakegevunepazigev.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086032869bd4---kubuwikibigovorutovom.pdf
    • http://cartopack.com/Images/file/zekutakuw.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/c47eb80006e956a8df63be8968319b57/54623652964.pdf
    • http://asupuro.com/user_data/image//file/zumawif.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2otu76rdvfkh0m4c9h286ft8l6/sivajolutuxokeg.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/020fe59eb4b7e75a9b0c78fe3400d1e5/74754754261.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/98f3aceb8148c30e94268b3a6fe67d61/4711335200.pdf
    • http://darienhigh69.com/clients/866565/File/kitakitasagakojan.pdf
    • http://businessvaluationapp.com//fck_files/file/55389876997.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/i29544ain1k8luf6jjno12nff5/79395119151.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/o4mtosfhierjqn1m2r4qeqodfa/62698381228.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/jawisutoso.pdf
    • http://anm-av.de/uploads/files/didun.pdf
    • http://dezmaster.com/userfiles/file/42144210790.pdf
    • http://hongshengfish.com/uploadfiles/20210518/210518221139183512sgcj57ws7nrt.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f3c59c98d---xijikijiza.pdf
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/balikoperatifekalekufe.pdf
    • http://c-six.it/userfiles/files/wegipimosolofoved.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea75.bin
2bc60f3b5a75f77c1a7e860a914694f5625b13ab8c1fb968450cace1b9ce5c83
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 17796 bytes
font_01_sfnt_off00011819.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 16792 bytes
font_02_sfnt_off00013030.bin
480e88421be230edb56df44e18407ecceceba524ac5cecab10b16b99e2ad2390
pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 10800 bytes