Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d082677b669e7…

MALICIOUS

PDF

131.4 KB Created: 2021-09-08 02:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f8a5618abe90beb4176981c4530411d SHA-1: 3d4cadf0e02bf8ab53d776b2aed1266539e41c44 SHA-256: a66d082677b669e7c1c78de8efcdb2cb5eb886c29471d7667a2423499afea7a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, suggesting an attempt to redirect users to phishing or malware sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6e2f2a90---pizojazawawogow.pdf In PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/19896372793.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/42230839702.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6c2b66412817cdbf1be928f98eebc09/japikuxofedapafalij.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/logojowuwigowujaduzar.pdfIn PDF document text
    • http://maidichike.com/upload/files/ferire.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/sumiz.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/73767928915.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc62cd53683---tabegajozagedutugizenis.pdfIn PDF document text
    • http://technocom.pl/editor/file/18814180358.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/rovalisetesujowavofake.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/97586786489.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/votururipovaxerutixeminef.pdfIn PDF document text
    • http://okinawa4d.com/contents//files/ridawiwe.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/5935797587.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fobinorakedenawofudiwo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f237ae17461ce700e2bc0b3f173021b5/bimilakepovozuv.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a901364d3---xakipekaw.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c977de314a4---32428765416.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/83270945616.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f607c08f3d---55148344843.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/35497167696.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f1ad0d00---matopedavobokedami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=red+eye+differential+diagnosis+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/82162944342.pdfIn PDF document text
    • 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_off00019aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA5 10832 bytes
SHA-256: 47a53258895556e3054b747fc41ca432283d60bb9cb898eecf6391c269212078
font_01_sfnt_off0001b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBA5 19700 bytes
SHA-256: a9efa4d0876715a7c92f786e005223da375eabe393f49737022662f77f1fe0ab

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