Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a85c8ec4b54dc6a…

MALICIOUS

PDF

83.3 KB Created: 2021-06-17 07:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c769604e12a50ecf5423df79d47df690 SHA-1: ee051bda2eaf534e91d6f3b424ef7eb5aed8afa4 SHA-256: 3a85c8ec4b54dc6afc901c2c5e2cbd21353221b5dc04ab32d6107b80cf61561b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body text, though partially corrupted, includes a phrase related to finding a line equation, likely a lure to disguise the malicious intent. The presence of external URIs and the ML classifier's high confidence score indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://irlanc.ru/uplcv?utm_term=find+the+equation+of+a+line+with+x+intercept+and+point PDF link annotation
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jenh8a2f7uh9m1487laqumchsl/45213653289.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/10423706322.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90db452da---55963584863.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/welutu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607816387b24e---44557826908.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/003c77a3632674d2de783f90fa41ed76/zedinupenepovapis.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f1c828ee---satexofexojoxuk.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160856aef82453---zewasolinobi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077def5e99bd---suwivona.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607882730baa0---4870998018.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/12088359199.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4bec0acbc---nakasozugigotiribopuzame.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ghalqi53rgb394stgr6l374u4o/5621536858.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/s26ihrui8ot618iaso3efggols/48323474429.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/fuvenixanonuvaf.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 5304 bytes
SHA-256: f874495f6da4e2422c5c67803828582547f6fd5406800218efc13b2a42328ec3
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 12052 bytes
SHA-256: 4691aa63eea914f2c429827229b3390d724835930a380783882dae791dcb6a63
font_02_sfnt_off00012cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD3 5216 bytes
SHA-256: 505cdbbcdc3a2d942d2212653891a7e62c36a02fa936700528b2cbab4453f374