Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d22631b06434df…

MALICIOUS

PDF

82.9 KB Created: 2021-08-16 08:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6d3d4dab348f072ef2a1ddae8c35463e SHA-1: 765cc0e62fbc96be6251ba01e7e0753afe0a77be SHA-256: 93d22631b06434df25bfb9463df6e515634e26e145b5f74573190db755fd58ea
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for SEO poisoning to lure victims with fake software download lures. The presence of these links and the detection results strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crysiq.ru/uplcv?utm_term=adobe+premiere+pro+7.0+free+download+full+version+with+key PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4217e504d2---nipakuze.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a55749a31---61824674470.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084850f75893---40251270816.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160790dbf1263a---lunidum.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210803163414.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607100e14b759---6245768369.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/guworurutuzofamawe.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tinotekatefozosunafixa.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/ruxowijafe.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/lodapuzilafuv.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160722276b653f---25077128777.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2a7aa878---kotaluruxuluxinotujuwod.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/50a71df75762e47a39fcc6773f218a17/fiporutegudijegagirobumu.pdfIn PDF document text
    • http://shesob.com/file/files/gasixepo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf711b00b7---40622137843.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/wawevesagogipalodafemor.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/32116104341250a8db7bdcd88aa2589e/63557193638.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/37896111529.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/867qp7hkkt19ia98j579gcp4m1/wilifusetax.pdfIn PDF document text
    • http://bulmarconsult.com/files/kititidokijativibuxib.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nib4arfm8dn2afbi3mh3n3qb20/66785157272.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/73828237875.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/31026595224.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/23472722799.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_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16992 bytes
SHA-256: acb81e2988fc38747ac4a02e4809a656618ee261d7d740a62eff6681983b9ac7
font_02_sfnt_off00012232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 11580 bytes
SHA-256: e26e8960d57862d0d605ae5af562dbc5e2d53ef44694014c351b874efd8016b7

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