Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbfba73405acb1a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 09:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e43e3936aebb339308779ece865b6ee0 SHA-1: c3cf0b3348e08c09592010f6d81dbfa12b6b4024 SHA-256: bbbfba73405acb1af984f2c6f1ee59d519f1cf4ceb771e5966aff6e91fe69ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=screen+mirroring+android+to+pc
    • http://smcertificationservices.com/userfiles/files/lusagubobibudaf.pdf
    • http://ohana1bbq.com/uploads/files/pisumejutevejemo.pdf
    • http://unite-chem.cn/upload/files/60992866275.pdf
    • http://fanti-fitness.pl/uploads/assets/file/95327580877.pdf
    • https://amgaa.org/temp/files/koxujidogaroduralip.pdf
    • http://dallapietamarchisio.it/userfiles/files/jidigukalozolakiteboxu.pdf
    • http://strap.sk/uploads/file/lexuvis.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/falurefajiwirasebifovej.pdf
    • http://musicpark-live.com/userfiles/file/64038024648.pdf
    • http://rockpapersun.com/upload_mce_image/file/55047313020.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413db5d0df0---80801204066.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161532e93722c1---levepavurodonasax.pdf
    • https://slotsonline.ro/app/webroot/files/userfiles/files/31364565718.pdf
    • https://magatek.com/documents/file/13670370334.pdf
    • https://takitech.hu/userfiles/file/kulimij.pdf
    • http://matsusushionline.com/uploads/files/51182650170.pdf
    • http://bycongroup.com/UserFiles/file/13205548984.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151166a5e0b8---88032863611.pdf
    • http://magooferta.pl/uploads/fck/file/36237203057.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024eadcab8---wadigojudug.pdf
    • https://atlantidegattico.it/file/11737284453.pdf
    • http://18554080.com/userfiles/file/33681210543.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b174.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 16792 bytes
font_01_sfnt_off0000c98b.bin
03a607a8f14b226dc096eb0a003d9e9aec1a13dd996127cf5cdfd952bd7de729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 10716 bytes
font_02_sfnt_off0000e1e6.bin
3b89ad28de7b6f594585d9b256bf6550ccf9ddf75593ac49448e4531e334f887		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 16700 bytes

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