Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b980c5b139fd420…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 18:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78ccdd968f0ad50e8a809d61c0bf1067 SHA-1: 1b12c8869641c84d094b25b19c3695151739e7ba SHA-256: 8b980c5b139fd4200c11d802265ad86c6a957a997d70acb7e61d91fd25633d33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The use of wkhtmltopdf suggests the document was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=fitstar+for+android PDF link annotation
    • http://unipsyclinic.com/userfiles/file/20210905010022.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/doviferawemepazomiridugib.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/69528279299.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/ruxefanozepudunere.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/volevunatovepuninefam.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/146fb27ed95cbbe96c29e0c6ac491a34/galaritodefajenovu.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/motisenegubakejawonuwiti.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sowofinisiwovede.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/rijafatolakisapag.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/81996148589.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d73cce468---jakarawivudiwekixip.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaefa8b566---nutopelavuxekapuka.pdfIn PDF document text
    • http://temple.mo/userfiles/file/mizorik.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/43539815164.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e6fd2ebd---dikek.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7d0b16adb0715ebdd27d1668785b357d/wewonejojewoboxijex.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/89096938703.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/199f62cfb83c30cb6c0c39cfadaa8fc2/meditumobixabudimawovena.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dapowanototixewenonopi.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/71341348845.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/padim.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/33064686965.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/55865556518.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/tujugikatepadivovunalire.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/43717082174.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/93404371838.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_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 17980 bytes
SHA-256: cc43800f366c92236c2a43b5fe149fe5317d4512f710f1710e7b6d64321bf49e
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 10148 bytes
SHA-256: 077b977ed02e5ad4f1e6cb7b187a67c8ec3673c0aa4bd2e59d75dbd856d56378

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