Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5af1576ba4596a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 16:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4843a01cd929c3dc36396b5f6df9fcff SHA-1: 6bf71cb1da034f557869876bef03650793abdd50 SHA-256: dc5af1576ba4596aa4bd89da17342fca1eb0267b4de92aac1678edeced541220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links, including one at `https://irlanc.ru/uplcv?utm_term=win+10+32+bit+iso+file+download`, which likely leads to the download of a second-stage payload. The document's structure and the presence of multiple external links suggest a phishing attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=win+10+32+bit+iso+file+download PDF link annotation
    • http://e-sportis.com/images/upload/78592266697.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614916faa4c31---konitapuruma.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109040810429652746lv5nj3oail7.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/77216068552.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614993e16e13a---32732453358.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/12/19773440083.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sedupurusu.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/15746533576.pdfIn PDF document text
    • https://fasleh.net/Files/files/54568722405.pdfIn PDF document text
    • http://thongthien.vn/upload/files/mukubopedaropakalenedum.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c07b9dee---topenadu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315680ddc9d---befevajodenenadogeluxazu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161408e2895880---bamam.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/pidoxisomifule.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/26459036754.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/zavuvetenolugatam.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/kerax.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/vobub.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/losetedujiwerigetanavobu.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/54680251206.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/sonavelaxarokotupix.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/pamizovogagok.pdfIn PDF document text
    • http://glassick.com/userfiles/file/70125803286.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_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 16108 bytes
SHA-256: 209ceb6264a00f987ee7271481e79d0f1c673ddffdff24a515049621be13302d
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 17276 bytes
SHA-256: 5bc17bee539d502c7d7c81394b98099e0f47eafcd88f2c0e3c86aad3a8cfcc97
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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