Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e292f6b5df0b21…

MALICIOUS

PDF

91.6 KB Created: 2021-07-21 12:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5e8743db6a619ac04c0573d32d412b1 SHA-1: 4e78629bdb481a4ebdf400ccd132893fb65e6d1a SHA-256: 57e292f6b5df0b210447c2155d62bb6b7abebea949335ecc1a322a36f0fd683b
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs on compromised hosts is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gfgc25lle42gh0de92v5b4sr0o/bexopegolofemafu.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fb2fdf0b8---45322223056.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/ridajiva.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/4c98edbd9a2d2660a3eedf862ea81ccf/wamozezazozudigowesox.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5eceacace---7554554167.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a3f826b017f719b74d3956a778481347/zatubaviwa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wipimegonodinada.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0c7e479aee3ba878cbf55c933a7048fa/24936736680.pdfIn PDF document text
    • https://morabia.fi/images/file/75163879728.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/12762449366.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/380f503582392bf5c31ea029dffc53b7/rolifiraga.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/bonajuzad.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/16623234331.pdfIn PDF document text
    • http://mopron.ru/upload/files/wimubudo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2e753f97---pemej.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/xikaruwijozam.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1e2fb7090cda2f9a1dbcf525439e333d/nugokanig.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/1869440495.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/71291227044.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/watifuxejid.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/regalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=epithelial+tissue+examplesPDF 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_off00010618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16772 bytes
SHA-256: 645da1588f219a8e1d80ad736faafcb00aec73824702df3a03e8586cb407667f
font_01_sfnt_off000131ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EC 10380 bytes
SHA-256: 9b14cf9b9c7bfbd64854ff6944c659558079aec326535d8b7069a2986ccea06e
font_02_sfnt_off00014971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1