Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37dd6cd7e7b09ea…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 15:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3f939bcbefd94ccc67791499c915bcc SHA-1: 9423b9ac5d73b8c1599042285a4409e2f3dca9de SHA-256: a37dd6cd7e7b09ea475b063ba6c7f3c954d35a0ab643687624488bbdaa30a759
204 Risk Score

Malware Insights

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

This PDF sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to host and distribute further malicious content. The primary attack pattern involves luring users to these compromised sites to download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089e66da266c---vabile.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fffd7ecf5---zegodaruvenakine.pdfIn PDF document text
    • http://jarosi.hu/files/file/javuvusizezuvigo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd2152e13---30813570528.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0497270001629512984.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f73b6338cf4---sixebemanesuvaga.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dff73b86b8b---52499542479.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/69270869221.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/pewakelimerutumojolati.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/rinimuzuxonizote.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f040ae9feb---22847464874.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9dh61ic68qhjc6ufpl2ong20vm/61335173274.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cc93e1ebe6c---tutodidetetu.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/jajuxetubojavasegaguleni.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a8b31bdf6---71418502344.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d748562a6d---65333147126.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/96023463823.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/16315338104.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/02/file/20210802_204756_110.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/farak.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sevuzarixe.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acf190bb152---wuzisufujevi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/sutatoxelidujagozopater.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/kuludesufiterefef.pdfIn PDF document text
    • https://samowar.me/upload/file/binakodetufijixov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vortex+diamondback+tactical+4-16x44+ffp+manualPDF 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_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 18200 bytes
SHA-256: cfd23b4116ac0fa00e7f54b123440c400770e013bc3ebf15e3fe7f7048dd8e6a
font_01_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 11348 bytes
SHA-256: 578e7151b8afa51e13cc756f74d9829ad6b745564680d13c9fd981f47d98c02f
font_02_sfnt_off00013ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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