Malicious PDF — malware analysis report

Static analysis result for SHA-256 582f2c8a5691a067…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 04:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4261172d8f30ac9bde501b57659e9963 SHA-1: 1845328b0a7f5d2ab3eed3ca2d2b50029545f7f7 SHA-256: 582f2c8a5691a0677d333f4360ab2327d0fe91432402eb0a3792acad0e678767
164 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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' heuristic suggests a lure to trick users into downloading further payloads, aligning with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiofantino.it/userfiles/files/46918520639.pdf In PDF document text
    • https://fzclicks.com/demo/files/editor/file/74983576016.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/73150476422.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9076e2ec5dd7db164d7e4db97d99355a/78326469961.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/5346372944.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/39382066998.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/51111347232.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejetoxigepimifiv.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pfe94hs95616ilce722lmmbl3o/mibejiboxesipebefeguxulof.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/xojirok.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/fenomanuwiso.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/79506504449.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/33037220735.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/bivetitiradavere.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/49330594090.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/4089008065.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/43805350213.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210902074528.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zidapamujowa.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/vujekorusevoxujuxoj.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/49083901913.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132490503929---dowogukabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tamilrockers+hd+tamil+movie+downloadPDF 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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 17484 bytes
SHA-256: 6ccdd98bfac9345fbd33a4f3de5694ad5faf45d2bb266b9dfbf194b127fab105
font_01_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 10840 bytes
SHA-256: 32bf4b0bfb4cba56e886b0a719881992a2cef845f065df6b488e585a0d5de718
font_02_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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