Malicious PDF — malware analysis report

Static analysis result for SHA-256 519958b07152b2fe…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 23:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a1699968ae1f0231793234742d1eaf8 SHA-1: 9abdde013fc36d8df58b5e6073c81106e1aa0807 SHA-256: 519958b07152b2fe746e3d92abe9baeb246ff9cf2bbe53fc81cb9d58754f00b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, with multiple embedded URLs. The primary attack pattern appears to be a phishing lure, leveraging a link farm to distribute malicious content or redirect to phishing pages.

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 https://nomylo.ru/uplcv?utm_term=send+html+email+in+codeigniter PDF link annotation
    • http://centromp.it/userfiles/files/7598377504.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a3ad06be5844501fe96d4d4a3fb9883d/85593901408.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/46327698290.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tmphi5dbqdbp4n68bo0samq852/febufesu.pdfIn PDF document text
    • http://gardatrans.com/content/Files/budakibatibegelixoxek.pdfIn PDF document text
    • http://24cvety.ru/upload/files/55614826719.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/40261105853.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kadivokosu.pdfIn PDF document text
    • http://eternaseguros.net/files/files/71511753528.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/vufifazorefol.pdfIn PDF document text
    • http://vaynhe.com/upload/files/29498424180.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/nexizazopazerifapomikawib.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/31932009832a67990c30f1234413b777/dupodir.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/sefamegofidukogizovarozas.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/12235371926.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/27560194654.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/bokejetiwij.pdfIn PDF document text
    • http://synfarm.com/upload/files/vurej.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/bupuxoguvixelojoj.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/zakotogek.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/wugibotolizozaseza.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/guviselewanejiwafalufad.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f5c6b05d---vanimogigupavexegufazuti.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/wituseb.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_off0000b519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB519 10724 bytes
SHA-256: ac8ae54e2fdeaed2a1ef43d65a0493cfae868bd66f547ce4ca52ee15a91ba6bb
font_01_sfnt_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 16800 bytes
SHA-256: 7752dfa319385815ee99ee19927d32b14365c1316eb36c13bb483dfd74b6f2e3

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