Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cbadd514e89d36…

MALICIOUS

PDF

91.4 KB Created: 2021-09-03 08:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a708c9bfc322dd0d45ab1a09483eeead SHA-1: b558e01560025dffc38b19a547562c2f621bfcdd SHA-256: 76cbadd514e89d36ab0419808db0c780037ad6bd898305f43480c3c77031cab7
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to external PDF files hosted on various domains. The PDF document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests a phishing or malware distribution attempt. The URLs extracted are likely part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://ashleymongolia.mn/uploads/files/bijolizipapesipewapituje.pdf In PDF document text
    • https://plagij.at/ckfinder/userfiles/files/mowuta.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mijatuletoluros.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/73461926562.pdfIn PDF document text
    • https://soechi.id/userfiles/file/71321934024.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/95067460063.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3dcd703a---murarijopolepimavexe.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e6c2d323a---momonakumi.pdfIn PDF document text
    • http://technocom.pl/editor/file/wedatifik.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8330d6e4a---19461357656.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d75b19a9---sovuwoturawewirusulusumil.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16079dfe858094---bidaxolokojewubuzipadu.pdfIn PDF document text
    • http://tw-go.org/files/nagemumopov.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/84649365262.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/91505947421.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/86950572010.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/fakoriwusozefeweriluxaw.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/kexixut.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/18355571108.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/defefujakaseme.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8208a0625---tazonudafirixaxis.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/69137aca31249547542aad6f9a748777/28512766968.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838af50b87e---pavobewedovovure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bbc+values+pdfPDF 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_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 17496 bytes
SHA-256: e23afc3d33db345ae7ceedb7c9b82e7a254ea67c2386926d0739f191a2fa6ba7
font_01_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 10460 bytes
SHA-256: 465b7d802d2b27e3988be3732a8eff7742ddc456e606ba9e1e4bed2251682f3e
font_02_sfnt_off00014818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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