Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f55e5e390ca5a53…

MALICIOUS

PDF

109.8 KB Created: 2021-06-13 15:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2f77baa0e3e395f0a1d3746886a437dc SHA-1: 8776c5fe8ec6adc80e0c6e8c98636cd68f722097 SHA-256: 6f55e5e390ca5a5312cf08b634db92153b2b243c05d52ffa71889c9c6dd51f46
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=best+dubbed+movie+in+tamil PDF link annotation
    • http://honda-vo.com/upload/file/18565709880.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1ee5dce6---97268921263.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3e2cee21---94275720478.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9608ad4c1---51589197384.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5f2673df70416c288c41e8f436eaaad8/45075319543.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/wofisezusafinonon.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/103c57fe2141c937a27385f2136db96b/891336878.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbc25e5a2---2892991320.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/iq8s5dodf5trfiiuvv0gtnh4ob/fajanawubebirukezirexe.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16222969876309.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/solipobafizetisidagobevu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f57e1c9b---wakomiliwikubanizusulo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/lojigikijowikabavad.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786bc883b19---zowifoxamela.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81kddrsju8sl7iceae6unug2e0/tasulorifizanux.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/271ba433d944b5541f6dd1e0cd24a5f9/weledesefalofidanetenuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD8 5124 bytes
SHA-256: f11ac163750074b167fb413ad0e725c5bb3ff6253428ddd59ab0273010e9906d
font_01_sfnt_off00015c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C33 3696 bytes
SHA-256: 9fbc7e138fa4a10cdb4174d7b1e22a8f0605e5d7240d278db356456364bc3a97
font_02_sfnt_off00016a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6C 12400 bytes
SHA-256: 5a8f1a98fee941d0caa96d4bf72f5832626b3b6c2bb07911f9e239fa90abf229
font_03_sfnt_off000193f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F9 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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