Malicious PDF — malware analysis report

Static analysis result for SHA-256 2027c425f86c8271…

MALICIOUS

PDF

98.3 KB Created: 2021-09-05 11:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 463556fc9f8f6f2226e4e900e0aebc25 SHA-1: 8f8d082ddbe1d4a6b907c285ceadac07eeec83df SHA-256: 2027c425f86c82719614f93cf10294783688f6ba7f0dd820b5aa58d8e437741f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains hosting PDF files, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pi1grne6d79dvhejipo0fvqcf1/gizonalalazivazu.pdf In PDF document text
    • http://studiogiovannone.com/userfiles/files/kivozofugitol.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/62366264821.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/9004520311.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/93846525667.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130404c754f2---xitexejarufobironawese.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/81049004366.pdfIn PDF document text
    • https://kenadong.com/contents//files/retadumozise.pdfIn PDF document text
    • http://keitbg.com/images/files/83032043439.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/99511229082.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/610850963.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/belevebamivimo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u6jgf9ci4p91ncvlps1582uuid/mafisefajipawopirijasalok.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/952cc755c6e952a253df49e94be24799/44130516945.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///75349131442.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bssr9ck1ol0h4a4csgi9j4q2pv/gagalewuwulojaganelu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d71e4d8b3---lugadixokefo.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/61152990449.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0911a65e77c820dc98fe500e10a21372/97633836874.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080171f73ba3---72439011785.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/zenatizebatezibori.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/nikapikesutozazadikidawu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612603d84f698---miwuxilifavenes.pdfIn PDF document text
    • https://studiorampinelli.com/file/deririjokefufemerabemobo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d447b829e---bumowifukida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=404+essential+tests+for+ielts+general+training+module+answers+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_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 17176 bytes
SHA-256: d8d15085f68c3e2726d2d74fe5986f6fbd722c74263f3c70b73cdac95978c94c
font_01_sfnt_off0001489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 11132 bytes
SHA-256: cf7effe2a05e774b4ea576718f34bb52be9bcb0b38a6ddb063dd33401363a7b7
font_02_sfnt_off00016272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1