Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcf7342bdb0c4aa…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 19:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00c11772281ffbb128530fbacd87b701 SHA-1: 3e841e20454485f00e5c1089c7aee028a144cb59 SHA-256: 5dcf7342bdb0c4aa1d1b4325d12e06fab393633144b60d5763c34cd6b5643393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=is+amazon%27s+business+model+beneficial+to+society PDF link annotation
    • https://tskrea.com/userfiles/file/84868387446.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2da9d299b1f2679dc4938e55fbe4b511/pebawakovenixunidema.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/vamedokokujavazij.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fegaduloranorofop.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/20455753608.pdfIn PDF document text
    • http://kccmaul.com/files/files/62935007092.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/rifosozipig.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/87762854132.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/mogin.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///78876199666.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/vogixegidunexep.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pjqrb8vsmuq146od8kkn679r1i/zosugowawidesuvazirun.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/o7rbalr429b33tvdeqs6v973k9/derobelonezir.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/76717112476.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/76714615041.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/saxubezojin.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/98485975101.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/juxolopepepul.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d4dd680e---22071141161.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a79b5e6a---99061431376.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/vexada.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/3c1e88bb2ce29fccdc1ad49ed87eec89/jobonawulazubonelar.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/58495072251.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb2a934aa0---29642210773.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0ec55e2b.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_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 10936 bytes
SHA-256: 9422e19e388590e3f3cc2d5b145d5f8fb623a37bfe7c99202e6cc7225ee1039d
font_01_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 17200 bytes
SHA-256: b91c55ab8eba9efb249e716e298d8de9d5164e9d65b7c3a771c361fa05e2d3be

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