Malicious PDF — malware analysis report

Static analysis result for SHA-256 127043fc8647c25f…

MALICIOUS

PDF

82.0 KB Created: 2021-07-16 11:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5125b01516abc9a93342c1cc9377240 SHA-1: 25b6d54278a1206349ce16b7b2cbe9a99f9c859e SHA-256: 127043fc8647c25fc8616a2fb46095097a22fd3beb4d9343138971dd527ec721
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 a phishing trojan. It contains numerous external URIs and link farms pointing to compromised WordPress sites and other domains, suggesting an intent to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=components+of+theatre PDF link annotation
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9412c62aa---tegipatot.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/wowivobowi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4nau5il1ag1m7kmkn59n702h32/sodunenurobadoso.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160868c88edf0b---27897836388.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/kupuleworixufiraxav.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/mefiro.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/wirebobosikawot.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/56155065554.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f99e55b0a---14481937710.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608831d8d2340---42992317133.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5ea3c7d16---44243755496.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/4706965077.pdfIn PDF document text
    • http://isvpro.com/custom/files/32452099627.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8fba138c6efb93bc8a462ec0096d5d0f/lokudubekiv.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddvde7ndbj6bgq27k6rl903lr2/40759803895.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d9b3f142fed9f630d812e5c5af91ce02/nabavokarofojadiporutebe.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/merimiwigexepuvawanu.pdfIn PDF document text
    • http://rld-carbon.ru/file/fobakefawebofepug.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e10907174c2---38768546026.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ab9e2284fe3d540a2a2a55308a22e0b3/sosodedidubowinesapepad.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/liwubor.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713aab154d---39478530960.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/xonigo.pdfIn PDF document text
    • https://banghenails.com/upload/file/81563974459.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rhq4pfbqrk2cn1mdfag2scpfcv/61380794775.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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 10516 bytes
SHA-256: ddba9bd046c92b59b74fd565ecb25d35e6ab4715addc4d5835066962a47fd234
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 16420 bytes
SHA-256: 8311aea8327468cdc1dc09029f7990aa4f10ddc64b4baf81a1e163d27f7ef7e6
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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