Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab33a1492de536b3…

MALICIOUS

PDF

94.7 KB Created: 2021-08-09 16:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 94f2b0953ff69bf03c9fbfe4dfa4c140 SHA-1: 3210addeb2f45d24d30d593e78d46f8ed99f0ebf SHA-256: ab33a1492de536b33bcd046e45a96f4526476d8d480e77ba0fc46c7cf9a3cda7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://technoculture.cz/admin/upload/file/nulovelanoni.pdf In PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cdjrgieit9m5se6djlbrnrbg7/64074489904.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/62a9da53f51490d9ab712912f5bdd5ac/pezibu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/laveralapevokanel.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lataremebabodeligikaxilib.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d6573656---demovowit.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea26278e64---lopemupavaf.pdfIn PDF document text
    • http://hanleyresources.com/images/19493440735.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/21289904999.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919898b0b50---54647111470.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/75059193439.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8b936dafea67fea445ee9499bcbbc54f/bezugusefadowivivareged.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7c92c8fff0207f49129ade286f68cd02/vexawegemoza.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///wopagasixivopapo.pdfIn PDF document text
    • http://fxmeat.com/upload/file/c11d3da9b08782278f11ab62ec350ed3.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/cae19b061a1b1d267962bb9b81802918/kajofiparaxilotefazi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/25193460389.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16074bd5e16322---fomerezo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e89d5f65686---nobodutilipilukak.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210806_120104.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731173b2110---sevibewaz.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/zowopadasilobitosoduzogeb.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4cc10d91f46bf488c09229cdc37799f2/kulupuwodevesejovakate.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d351304e---27804298809.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/fopovakokizino.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/49808640558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=my+philosophy+of+early+childhood+education+essayPDF 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_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 17040 bytes
SHA-256: fba75aaa3cf245956bd336cad917244ef1957b94cdb6760be0947302463d6c50
font_01_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 10924 bytes
SHA-256: 5f544ac6304c16028470b1ca3f640a432a2cabfa80679e2a1053a6d53e86619b
font_02_sfnt_off000154df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1