Malicious PDF — malware analysis report

Static analysis result for SHA-256 76156b9ab339c669…

MALICIOUS

PDF

122.5 KB Created: 2021-09-06 18:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2412d32569df97c9b0a73825643a6cd3 SHA-1: 42243d11ee02ff52b61c4e611a89a4af715e3e26 SHA-256: 76156b9ab339c6690a088708619672969e104e6abe9c6a3ca1a93f9a4ba2c3a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this as a phishing trojan. The presence of multiple external URIs and the nature of the hosting suggest an attempt to lure users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160976f0f38364---18056704377.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/84596825564.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/97125456578.pdfIn PDF document text
    • http://capital96.com/userfiles/file/muzazepumakisemudinu.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mulijevof.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/bobapaxinevemulepejob.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6a02a741---zadawumexewevulokazovoju.pdfIn PDF document text
    • https://kristinanamaste.eu/files/jegovagef.pdfIn PDF document text
    • https://parc-hotel.info/file/kasojukitomigevesikonur.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zitofetilij.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/66162884053.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/guxep.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f4fbd8e8a61ea79ed3da93990af8e5f4/41138435811.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/savapigug.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b27qqdcchqm34vs7fbebrqappn/6234501622.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/39532656525.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/99e122f3769b378a531dc47f22d9142f/61688933200.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/ripipumokodezolaxasiboj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16086e94264944---90024633076.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc85568e3---fotosixaminofafuragele.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/0d85c91159d4ae7a154ba2bbe4f3e123/35354518188.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa71b0ff---xuzijimefuwikeriwa.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/91711053119.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/14b9458bb99dddc07ba4735ba27c0afc/92876637204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=varaha+swamy+stotram+in+telugu+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_off00017635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17635 11212 bytes
SHA-256: be23227d04b8c8573d3c907cecbf25e23c134fc840427116a416cb05586d5d3d
font_01_sfnt_off00019028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A83A 19768 bytes
SHA-256: 33941771b98683a6296636dc18add86bb4cb0be6b32e0c34d9b094730843be13

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