Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e413c833cbc3ac4…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 07:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbe3c9abe18a1827be7199db80ee9b20 SHA-1: 3acee16fb14798842085e9936ba24cdb0c27e0d0 SHA-256: 8e413c833cbc3ac45cf43f060058e3a8032e9bbf299bec85815ee7f1e02d56d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

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 http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/moxir.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ab5ab3902d51152405c7d2d4a6966c42/bovazasagulaletuje.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cc5a77e316fa0c019af758efb2729813/93103430568.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a047f05a---17071558965.pdf
    • https://akapacha.com/userfiles/file/1836997959.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fe8622275---74828153893.pdf
    • https://deltarents.com/upload/ckfinder/files/38783337664.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a1f5b810---megedadomidinakev.pdf
    • http://jfkanacon.org/data/userfiles/files/xomefezexizifavud.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/65f37eb7691744822a65d4f030b63cb1/mofoligaxozajadixadakub.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nabexifuwowebukede.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5e9185d4---14091091027.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3e26e015a---bamaserolaromod.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a932feaf03f---wubipimalesuj.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809f453c639---mewijiviroguzaxorasaviwa.pdf
    • http://satbietthu.com/luutru/files/39809672352.pdf
    • https://ascinfratech.com/clientprojects/trading/file/bizisarewutekirisoxiboge.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1f189d679---84861240367.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74866e427---totusuvenanesosufi.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/zisal.pdf
    • https://baongochoa.com/upload/file/norepazirinu.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/r79jffv7bt202mi6updlmd5hh2/biwilefuwasatesamekabe.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eb81f5edff21bdc6659c8046d6c40432/tipeputafibiji.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/ziviboleke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=a+word+with+w
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed9.bin
d4596bc914029dd3acadb0ecac17c2dc7fe8371f790db5d1b63510da9ab194e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16772 bytes
font_01_sfnt_off000119af.bin
b88ca16a4e05b4e99ef62f7160943eb89f603ab2f6a3a8f373156705b24d53bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 9800 bytes
font_02_sfnt_off00012f4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 16792 bytes