Malicious PDF — malware analysis report

Static analysis result for SHA-256 954cb94e19bc821e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 12:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3ad6780a3c88be4462fd8ed2a53a3b3 SHA-1: 7fcebd747f6eee066ae0728bd612e8a6b9042c6c SHA-256: 954cb94e19bc821e7d951ee79815c1f98dc2df6bc2e54f730ed9e867f41137e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=curriculum+vitae+sin+experiencia+laboral+pdf PDF link annotation
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54843647239.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/10525507636.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ia0nfmjlqt581umj30d0lnc04f/88279342883.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/57695946844.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/88919575977.pdfIn PDF document text
    • https://dragulf.no/files/file/16166148736.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ouu2me31ro441op09sh3c05ju4/68348059471.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lbshme6epju57fld2nliaps5au/94538751174.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/lejuvefute.pdfIn PDF document text
    • http://valeneighbors.com/userimages/30011078615.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a43cde9e3---fusofojoriwopuwujomowog.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/omfkp282rb1e0tclrc3tcodro7/mukubenupo.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/cd7cd2488218bc115c69d0fcd34c2b6b/rafavoredegumabukanosapu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831659d5922---fapemirujojezefi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea40ef9a1---xigejanazifixufoliber.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/bukexixelurizafesa.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/7530751735.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/bunetu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0c353plrul253ipc9j8601spt2/kidikakulanag.pdfIn PDF document text
    • http://bayihoki99.com/contents//files/bolenadeb.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/95278059951.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wurofifekojixekezajuxisog.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/tumuvut.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160774b5b70978---bewadasivabive.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kugijijalerixodamagamep.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/6769150825.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 18676 bytes
SHA-256: 57c42e3bbdc50155067b469d9e10598259bd4b28066c6d005633b824fd889286
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 11220 bytes
SHA-256: db62d0efcbdf63a33dc1632b339a62846ae0a3ca7d0242965384672ec5184631
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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