Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dd77b9ba51cbc7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-05 10:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a541a090ffdf5e0f3337b3420a5f4d95 SHA-1: c1652296fa7ad6b3b7541ad12a0638a063558b45 SHA-256: b3dd77b9ba51cbc78442d7bc2575c7da368ae9f7617b51fc438806c45200d580
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 0.9965

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 http://namthangbasaltstone.com/uploads/image/files/gusujaxisipimozebe.pdf In PDF document text
    • https://fivetc.vn/uploads/files/78785510081.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/27118150353.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b9277ca567---mudolixogideritiweriwaf.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/92973072451.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e0be3d177---96042607193.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0e45f71e43deb8ef9f4d8e733d65b851/lezufu.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/57688953634.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afac0d6162a---faxotodaj.pdfIn PDF document text
    • http://apple888.vn/luutru/files/3724688126.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/26287481722.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ce393cbeafa2baf65e9057091785017/76845268274.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c833d0c2ba---87945472409.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/1ea9b69a523d1c276950277b649e9d2a/mimizeri.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/bodadaserok.pdfIn PDF document text
    • http://k1a.ru/images/files/file/94870528309.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6745e18708---salarejibowaxatomipafiti.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/21529379514.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/xebavut.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeee4595cd2---wuweralujamunasi.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/94456188925.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a099e52---ramivedajakorujepor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+printable+making+predictions+worksheetsPDF 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_off0000aff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF5 11256 bytes
SHA-256: a01d8e2a65a879f8f47dae62b13d75c80ce5f5f8c432999029b2d695c92355e7
font_01_sfnt_off0000c9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BF 15096 bytes
SHA-256: a51076770077e169dbfb658de6ee573f39dcfc18fca15d76a3db6d2065fbd549
font_02_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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