Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53ba3ffafba03c4…

MALICIOUS

PDF

74.3 KB Created: 2021-08-28 00:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: deaae964eeb5998a521c9795598dac99 SHA-1: bdb4584f2361768b5aee4ab2466b305f43695da4 SHA-256: e53ba3ffafba03c42abf0cb3490c3a34479cc2bfedebfa0e325b4c07ac0bece2
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 WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded links suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasuguparup.pdf In PDF document text
    • http://nensi.si/upload/file/91217177969.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a68cd00812---9052111126.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/vosudalipabaxirexuxobes.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1132813afc9dd5d8040aea9f5847661c/kowagib.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/wobutufarinezevaxowosog.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/dexufafove.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/dl8drnfmt6tj0s3nl6biqop3r1/37661938681.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/22897938338.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/80d29e55435cf4866b986b1eee2a4b69/83414671242.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/setinupa.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/71056224463.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/97544f195711756753333bfa09308143/66817154531.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f437b6d6191---33447562489.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/soweju.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ed04hh9jmfk3835dk5ljgmcit/31151983328.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/3ce66mf5vh7i1u1md8rntno4k5/34303082223.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/28080099258.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/pubizusale.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/89802769108.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610dae2df1fb7---vivitojimoxavo.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/27207258253.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/95865503094.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/tupikulogimumek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lang+leav+poem+about+lovePDF 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_off0000c019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC019 16724 bytes
SHA-256: aea8fec32b184a4f918a1627dd252ea1e0ecbb58a26a9c51322d9a0fb1ae322a
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10496 bytes
SHA-256: 89632f9469eb4c3571034a0ba6f8b442d8563166827f33e08aff74f4dbf474d9
font_02_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1