Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c8d148a0e4f6ee…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 02:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0d91a8d3bfcb13a413a73668f44de8e3 SHA-1: 0e5273545221174847a021caa5e65b7ad5924374 SHA-256: e5c8d148a0e4f6ee6d3b05b4095da414fd00b9fb3f9ce7ca8c848031ae8846c2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The PDF itself contains no readable content, suggesting its sole purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adabaskimerkezi.com/upload/file/34575900407.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c421b476807---pipopapuzoridigodin.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/mudaxogegod.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/13362892095.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817a67d18be---4050295125.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/sanudopapeburenasutan.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/wazimijasoxomobonabot.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/38811989588.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vunofaxelekoniwujuderabol.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/q7o661m6vf802te0eef6dhjkhs/gadovaxexikipatesine.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/71739606410.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/86318735173.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/lemagusumoworesureb.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/78365198323.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/mosedotu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607679eccfdbc---55880651112.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b5mmn2cqdcufmcthrpo731q474/83008343725.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d5fdf6286e60d716beedac4349b5277c/67166724010.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/savadozumaton.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/tivatuvu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f217766c703ce72c818d1b52b20ce8f0/derogovizugotawuxud.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6eonehsl43rl2jkbei3d26iss3/88110501243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rewriting+sentences+exercises+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/jaxezuwemojabimiwixotenoj.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_off0000e240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 10700 bytes
SHA-256: e8dfc2c23c5ee1bdc28fbbd41d6d5f2134e0ba54132271f6f80dc904ced20ca7
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 18376 bytes
SHA-256: 21a6cdf15ab94869ab78cfa9e0bb026b94d0c2a89be4c58bd502f6be74dec91a
font_02_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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