Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb45196856ae900…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 16:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b32bb3cd4773a082054e105100af427 SHA-1: a164f2b799508432f41aecfe1cc1062e6f2090e9 SHA-256: 3bb45196856ae90008e2c7a0399f9dbe2b4668bf27602cf0a8f3252e5200a161
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=contacts+trash+android PDF link annotation
    • https://dcmheavyequipment.com/admin/images/file/midapixudaduzuguriw.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/pekekiwujudekesutemekoje.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/24731485059.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cdfd07e6433d59f3e6054822adce07ce/sebavajem.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/20663206620.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/56009327445.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/41035886014.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161417ff5a0a79---bixurevarigogelek.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/vexozodeguponodakofeme.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/22813403286.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///45971201142.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/83304891340.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/dikuxexuvububo.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/73617871193.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/tenala.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01d19dd3c---rejijufusefag.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/74313427384.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/95308421684.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/fogod.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413f504bb63---xazoxebisirosedixutikozir.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/7380656224.pdfIn PDF document text
    • http://gewald.ru/content/Files/sulavagajetikegisugajuxu.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/25791511463.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/83661026307.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/89465853217.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/96685180177.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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 10320 bytes
SHA-256: a8eab4dabfebd51b180a4661b2056aedca4c5d8fc3e5ba236de22666c608f584
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 18184 bytes
SHA-256: 61da2f34330372e2c076dc12ada5c71207ef1aaf4a1cf2cf2a8d2047c574d5de