Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb5d75ca146cc16…

MALICIOUS

PDF

77.8 KB Created: 2021-08-05 01:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d344fa9876d361c3bd3277452bd524de SHA-1: adc175e96ac63c0d4ed4076c7ca6f92f991d8514 SHA-256: bcb5d75ca146cc1696855bf5ef6e6dd4579b8a4a42c06c6d7db41d75740aaa42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pistant.ru/uplcv?utm_term=elements+of+programming+interview+pdf+download PDF link annotation
    • http://graficaeformazione.it/userfiles/file/gesisejolet.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089342eee08b---vowufuvezapuvugesenowod.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba2dabc84---38227183665.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e95ottfm7gjfticceqq3veceup/rigeb.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/092fb49a8c12eb59856a992bd1e016f1/91237054468.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2c312948---nawonatapemor.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8c09e2b475421e1e800bd42be526e4df/43370516839.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/71152805440.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca357aec461---3679828796.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/2c3ce255feece395f2995611617b7a5d/40073261769.pdfIn PDF document text
    • https://schmitz.cz/res/file/kugupawuz.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4h6v1sb9mn0g3pcgq26t1ok096/salagolisazonibobovu.pdfIn PDF document text
    • https://mmszke.hu/files/file/rudiladupivenavijiloxuxe.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/zokatuzaleja.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9c6b926d87a59012879a23c9c2239d2a/bidagelapuporisen.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f704e85525a3a69fd23e2bf61f164dfb/kigutitaxig.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/gedoduvovolexajasesepako.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/66307255984.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hpjaek7cgih83tj1v25r85nuoi/josopotezopexojitekikemeb.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/67549408324.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a4d2f5173d850f2d9df3387a8e9df6b0/lolonisivumadalexabogarar.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/0eefe72d3f4b487c1c3f50af92d598ea/85228716370.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_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 17056 bytes
SHA-256: 1e47cbbe4e959d89d67ef8a92cb5eca2e85b85cb7d6f2340af83555a8ecf1ade
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 10976 bytes
SHA-256: a6bbc926d812f53dec456e2859856ea471118cab9097436a19ad71c095dc90dd
font_02_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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