Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e1b495bef7891a7…

MALICIOUS

PDF

90.3 KB Created: 2021-06-18 01:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 68f753c61ecced9950092f0abb968205 SHA-1: a2ef5293c109f81e61fe9efbff0fe9eae9e57b45 SHA-256: 9e1b495bef7891a77e8c5974cf92057a0c2e73bfe66821404a1453fb9694e980
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple compromised CMS upload links and disposable hosts suggests a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077927d78e65---36544262130.pdf In PDF document text
    • https://betenagro.com/sites/default/files/file/kaxevusuxibemototetewam.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dafbc5e3c---54529876236.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/65000586592.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/kobesaxeminisapamem.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/07808e264e79d56fe588340e250f3f31/91199488439.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/sidutedatik.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070719227686.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ee79718fe4f846c56ceb298d9f97441b/buvabigatuduwerezo.pdfIn PDF document text
    • http://strandedtattoo.net/file/lowatotafig.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tuzafavenikadi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7dbba6e7---60501550397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chad+virgin+memePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 3448 bytes
SHA-256: e1d916ba0fd970645d70ca71ea5e2753c70ea92e832eb46404f2af76d5ddd393
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 4996 bytes
SHA-256: 1f0c0505c03b1ebe622288f23527c39202d352412c521cb21663257d33aa481a
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 3924 bytes
SHA-256: 31412fcbb3bf19d45520bb7ce6b88a14234d93f5477410e9d8d0711bc85984a4
font_03_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 12044 bytes
SHA-256: 37d093cfdd856eaa9f737147790978704ed4a4335f4387db4d5f4608593f0ba8
font_04_sfnt_off00013eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFF 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_05_sfnt_off00015356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15356 1764 bytes
SHA-256: dc660d77cae4b86de9a1a9ca601745a0be83496e693a821dd54871ce10995358