Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a4bf0b9d2d7325…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 03:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02d7125d1baa91e9f45ade6fe7b7eeb3 SHA-1: 54634f47e396b2a55aad2be42ae023bbf7a1d31c SHA-256: 70a4bf0b9d2d7325dd4b9794816b0a2444eaa369fa8d4df2b30f51dcad94156c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and numerous links to external files, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pensiuneavalentina.ro/app/webroot/file/43032452122.pdf In PDF document text
    • https://radekslodkiewicz.pl/files/file/pugewipumewezunexa.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcbf44083e---82962555349.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/kilure.pdfIn PDF document text
    • https://blogsma.com/files/xigixajilonofezobifus.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/betikizofiwopeso.pdfIn PDF document text
    • https://unaizahic.com/Files/files/likunodedadamajavelelol.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/kerobaloxuwaze.pdfIn PDF document text
    • https://webmenuplus.com/images/file/zixitomena.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/9697647591.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/bogomesitenora.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/11562691899.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109060648535672.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kp8qjjaocd72ojnev78d6l1n50/99534692946.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/m2cs8hkro04icase2f69u96n5h/nonemofitozexolavixive.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/dodofusutafiw.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/43877501864.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zofarufabonenuruw.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xogojajemonizoponosepidef.pdfIn PDF document text
    • https://blogsma.com/files/tifinegapabopozonoxipu.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/81220605719.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/jusur.pdfIn PDF document text
    • http://adurucui.com/ckfinder/files/63992081908.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/wadorepit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=play+store+hack+mod+apk+downloadPDF 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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 17556 bytes
SHA-256: 48218574ba3a97fb564ab95c26c1fb8bc690a28a88f1336b4144c49fbb2c8101
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 10980 bytes
SHA-256: 7c287c8f07e03db449ee2c737638006be14dd54547e40dbdcdf35751335e0920

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