Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d45ea9155ec0cc0…

MALICIOUS

PDF

71.4 KB Created: 2021-06-10 21:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cb6c19edb7c7081ba994b6c531502523 SHA-1: b7b8a10c11f63748ac332bcc77246c01187bcdfd SHA-256: 3d45ea9155ec0cc00de32ef7d276dff39dccc6baa2f829e45c2039b1f042ac38
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 0.9998

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=measuring+to+the+nearest+1+4+inch+worksheet+3rd+grade PDF link annotation
    • http://ggmtc.net/userfiles/files/monuwawamak.pdfIn PDF document text
    • https://inifd.london/uploads/file/kulasujuwejenawewe.pdfIn PDF document text
    • https://scriptdd.com/_file/file/45708890718.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/46903861559.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c5271e98e---sagawebepe.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/79864439759.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c6270938---ridoni.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e50f7c15afcd99d41ea45626e58d1091/4295612035.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/kemolinexizikubidaba.pdfIn PDF document text
    • http://www.heksan.com.pl/file/guturipodi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/79887626957.pdfIn PDF document text
    • https://coil.hk/upload/files/daxafunobunukarut.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85548b0d41---wovanifelaj.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/57274680031.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6c95feebc5a874bf5536133359901d8c/wibineweka.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/sasopidodiwibo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/tilifinuxedisojumexatezaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 5516 bytes
SHA-256: f511f6216b507af24b0f74ed3df3e70647767d6a7b9ea27896333b97542a0a0c
font_01_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 10148 bytes
SHA-256: 64ea13cf9602d953f2d26117d14915177f92054645017a0f8682f243054d5278
font_02_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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