Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a5797c88234867…

MALICIOUS

PDF

114.2 KB Created: 2021-09-04 21:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 864f35fbcddcdd28140538f539cff4dc SHA-1: af9d861387046ae5afd56827f16f6285e3181845 SHA-256: 87a5797c882348673bd269d7b53b2c9a958196efd45088050d39911280563bc7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous URLs that point to compromised websites hosting further malicious content. The primary intent appears to be directing users to these compromised sites, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76209dd9c7---xenedekulaw.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160813bc77cdd9---vomeginuwatodoluliduva.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/p1lfpicc2fj9vjim42rkvt3ob2/30439744139.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/19980547597.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/serakiposowexepepapotizo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/87715312912.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2683f8f59a---dazilo.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/kejekumakufabot.pdfIn PDF document text
    • http://soles2walk.cz/data/file/73879113241.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607011900c771---76642344858.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///28218675299.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/sipejumomabo.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/95763621134.pdfIn PDF document text
    • http://askort.pl/Upload/file/wumexotozolativuxovog.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/vemipovokegewuxa.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/31588135180.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7345a2db7a---21559659385.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511203039.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/5529453789.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/57000475152.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/sozijazuwarorutet.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/26854073326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manual+centrifuge+eppendorf+5810rPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BE 20056 bytes
SHA-256: 2dacb64c74d4e424196472d8847b6a7531bf71f566891b2218aff8f3c51d86b4
font_01_sfnt_off0001880e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1880E 11236 bytes
SHA-256: 2eafafa7b673771b167a0d035d04500912269717aa18b563667996a629e4c795
font_02_sfnt_off0001a25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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