Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8c257f7b158faf…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 14:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e0ccdcba6830ac00db73211581ac110c SHA-1: 70362032b5ea0ccf042a306b0dd6dde2b150311e SHA-256: 9e8c257f7b158faf1486fb715dd8ebb7ccfe5cf2f30840dedb1897f1488509b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a malicious payload. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=shareit+file+transfer+app+download PDF link annotation
    • https://stichtingech.org/ckfinder/userfiles/files/38259085675.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/dikedigolovelexokezo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/8kgn0rgqbnfjmo027t7n9s3hu6/59280747465.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/86b036868701c54bb736d8e07288f33b/sivitilew.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ea3ca898---49108327191.pdfIn PDF document text
    • http://arablift.net/userfiles/file/didiluseb.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/gejanowulufewilajonu.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/jederi.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/2439542258.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/85090611757.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921915306484.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kenakutadaroroxadirer.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///7914703799.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/gogizasepajadarevulenegil.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/gatagekan.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/30023125860.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/87162195523.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/83390760672.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/dirimodare.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138420aca90a---16059021490.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/divolivibabadurifas.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/mobixupa.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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 18264 bytes
SHA-256: b878515f1beaaa9fa62923a20dc056504043ecef7d82164b4e37c3f0913d7773
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 10756 bytes
SHA-256: aa2de66befb0a1a80f2e947455b93892e8207d0e288e45b122df16408b1d378d

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