Malicious PDF — malware analysis report

Static analysis result for SHA-256 d918ff6b103ad202…

MALICIOUS

PDF

91.9 KB Created: 2021-07-27 02:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cbc58e2d1b6f9748c864c14ae3d5829 SHA-1: 114559326966767e4cb4b40b503400f0221f4b9e SHA-256: d918ff6b103ad202587ee5b0711aa05af3b48adcfb90712c1af57a9eeee3e458
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://americanpetrochemicals.com/customers/CMS-IMAGES/file/32350006980.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096e217a4501---56848728362.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/51891663225.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be2a91ea7de---52745928839.pdfIn PDF document text
    • http://saydersan.com/firma/files/posevikejujatidunukivoso.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2lurk0ladl1g6siauchv127j15/venobudebi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2125a0f413afbb22ffb43e381d18387e/zifikupiwelosef.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/50008818005.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/giduto.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b823d619e80---11412627912.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/bobolo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f58c186727d0d0e7ab3c357c5c4006f0/jegurejuluzigonuzali.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8vivopq80ovfduu1v8pj3q76hn/573654208.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/dagobagi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7fd8c42ed---vejubodiluwezowisu.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/konafemazutexexesulomal.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/cnjg5jthipoatqgjia8oqhd1q3/lisofejozidireta.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/3e493bf2bdbacd0b87f4e7d48defe31d/nemedikamevofukikobipo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ad26495d---dajeposixogapipevelixok.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/h3lq1hot3ss021ijs22vtvi8jm/47564640206.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/kazezesofuserakaruki.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/monexuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+an+ultrasonic+diffuserPDF link annotation
    • 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_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 17252 bytes
SHA-256: eeb2ff26247fe10fda4721f23ef4f8097102347ac3c1a021f73f71b69a5624cb
font_01_sfnt_off0001301c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 10644 bytes
SHA-256: 058ce8dee6ce2b652d8f4571440cfa1fb72ba7e9ed9a9b28b59d54feea5f2b82

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