Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e3ffde5ecde1d…

MALICIOUS

PDF

89.1 KB Created: 2021-08-03 09:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd2bd039e5cc31e6c14382447cab49b4 SHA-1: e2915e54de600773c24e69f8e5c75ffcd0cbdc71 SHA-256: 4a1e3ffde5ecde1ddd64c24d7fc3613de0cd891ac7a4aa638166b8a82746a483
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external files hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation or to distribute malware. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://diencohoanghuy.com/media/ftp/file/53223441334.pdf In PDF document text
    • https://pima-alarms.rs/slicice/file/43526396242.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c77ec9bb52---gosibaj.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/54637187225.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d68afac7---jusobapifebid.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5bef81527---71463345992.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/rikuvavorelixi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/glvpkvs6rn6klifq19i8mssiue/34070055000.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jiip6u3cnh0oc9lqhbgliq42sg/tuvujanugasatasoropowowug.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/10kns77oi850327topfe9mhmtj/kopevovagejisizarega.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/umgo5a38uul7567morl0t6rrs6/91505277946.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac4c04a3b---99777926566.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/liwaj.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc889ac6b04---9509509254.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adce96509c8---25693574860.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106572ac420a---75418064979.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/23db35c56010ca1ec3c98da68a7d6459/zumufa.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8615f13dc6---jitigotopelo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f184b294c2---48658583899.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/433935333418d183e68b8b606f0dd9f9/zulasolo.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/72356815146.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/budozulafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hachiko+full+movie+download+in+hindi+filmyzillaPDF 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_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 16748 bytes
SHA-256: 9a89a6a2beff283d5c53927ef61aaaf796ff4f90d57757e79a2f34599c259e07
font_01_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 10884 bytes
SHA-256: 6dff8da71b2752a2bdce23cdeefe5ef0a1faddd090e968e0024b4ca286fd35ab

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