Malicious PDF — malware analysis report

Static analysis result for SHA-256 91918e24d4b2a9fe…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 18:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8729d17f6b9064c5fdfb0c0f06b303ee SHA-1: 19e4462b153dcce857ce122cfc2e4233d3a104ce SHA-256: 91918e24d4b2a9fed755327539515f9ba478726a445450a4d8fc10bf234b7a69
184 Risk Score

Malware Insights

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

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aldapa.eus/files/galeria/files/xakatun.pdf In PDF document text
    • http://goteneplast.se/files/images/file/jitiluxumajozaro.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/89037375504.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/70851231210.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/34290348904.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/92916830569.pdfIn PDF document text
    • http://halanmilk.com/upload/files/bosetomelixo.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/38812382526.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/vexumoreniditemuputomodu.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/palufurivobu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e0e4534fe26e8cc6c1669df594cca640/19392255772.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/44943859953.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/raxawisetawagajezu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e345be631---xipivefazasujitujirebojed.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/7588677211.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/49973285412.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/2899655636.pdfIn PDF document text
    • http://bluebossa.pl/files/file/kalekavovu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ba55ba48afeb7afcea9bd612c6be8fc4/favujelisobusufejejuj.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/dokob.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/fodokuxego.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/wufidozudaw.pdfIn PDF document text
    • http://dezis.ru/uploads/files/55587598814.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/satubunopif.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/mepemejugupezevime.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/44646986423.pdfIn PDF document text
    • https://tmtteks.com/files/xubovalod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=below+her+mouth+full+movie+free+watchPDF 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_off0000b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 14380 bytes
SHA-256: 4f1f38807890b0099009093d36f37d2c704ff445ae5f1060af4da30c579f72b1
font_01_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 10632 bytes
SHA-256: 0a97a7461ca234a7096652a1eb552f9ec6e1286b14b4fcca067a9fa3dc5ad50b
font_02_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1