Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c31b408517ae77…

MALICIOUS

PDF

93.1 KB Created: 2021-07-30 02:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f5627b433134f72ed44ef9fb953f5ac SHA-1: e83277f2e7e3c450998d0de9ff01a94560c48fc4 SHA-256: 75c31b408517ae77c49054066ad37592e1bea409352b84e520af7779e02a05c4
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification further support its malicious nature, pointing towards a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=brute+force+password+hacker+apk PDF link annotation
    • http://gtshotel.it/images/file/panokavuzujevufagobetu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/goxorid.pdfIn PDF document text
    • https://egf.tw/test2/images/file/tetuzame.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/niwupa.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/wijofopijuwawugotofuf.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/10268976976.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/14115382670.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/remevidolobezufetalozax.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/gifikulevizarubetirizuze.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/zixoda.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c927daddf9d---pekekog.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/68574727913.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fa642410---1038353616.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/79802594760.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfacd43916---99825732246.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f6e17e10---zezunibilitutiwunem.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9dce493803f333c1c2130f89ccfcbf54/32463680728.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/38b8d53a97ea3d8b93360ced4997328b/93157596986.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/63ot23fbvkem7kj9oh2gj5bkl5/zasewuxokojuvetemajidi.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/mubare.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/nujusubomitebenesiwonilo.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/99710850866.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/gogizujetedigu.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_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 10804 bytes
SHA-256: 1c9c62698950037c546ace3c6d146c46dcc326969bbb1d81a568f1dc3c366c55
font_01_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 17272 bytes
SHA-256: 4fdf0a3424240ad1272cb93ffc94f3eb4344e05cb308e922c9f356e71e00a953
font_02_sfnt_off00014d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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