Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e85220ccf90ef4…

MALICIOUS

PDF

101.4 KB Created: 2021-07-08 07:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d14b45ba3112fcbbc03d6a26d11fa12b SHA-1: 7146e10de83bdffaa8def0f4302738b1eece6f5a SHA-256: 57e85220ccf90ef42b80c25af0cb1407fa0cd617c0b0df7e6c417e2731fa2933
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters indicate an effort to obscure the final destination and potentially track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://wastran.ru/uplcv?utm_term=assassin%27s+creed+odyssey+wolf+den+in+phokis+location PDF link annotation
    • http://studiotecnicoforace.eu/userfiles/files/90592156856.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qpu0n1b1hma3f0t16m7aes9eu4/nomazefekeka.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/24106e4576a03bbf5c101f65fa3d93a9/munepogafikelari.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609493c1b6e01---89632302840.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f4471dcea9df9c4c8b612f3ed12c1692/28750482888.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9ea94dcf---zoliponoxazusuka.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ba0cb0ce---wojabekorajazuzi.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/dulakajitisijekireru.pdfIn PDF document text
    • https://digireg.ru/upload/wisedunimavomon.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/11cb3fdcbac52012f6054cdd10214698/8418092225.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/ruzapudixezagonogazatumo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4c985fec---27527014124.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/47845859225.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/wifesezaruzugefubegusobuf.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d5383857---75067142384.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6c97cbf892146d82580208d28758331b/munonobotikesojimati.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160776370bba79---27072154941.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429135140162097.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/93632797151.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p0gk9rqurr6rf85145ug8nnoa8/43037756039.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/fuxifijorebazifosukixi.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/zimovawe.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/78e89f5369e9525087e5e97df504a8bc/lofavujotevuvavuxizu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/nokinebunilefiter.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/gelotipepi.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_off0001283d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283D 17780 bytes
SHA-256: 2f3723225ec9f9f3114ec10e7f5df47dab338ed978712a638a3f590355c1ae2c
font_01_sfnt_off000155e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DFF 11024 bytes
SHA-256: 17d2fcc10ed0c8df091fb909f8994e0aaebdffd57c08d9e7c67e4dcde965e0bc

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