Malicious PDF — malware analysis report

Static analysis result for SHA-256 0164d05e5a3f9fc8…

MALICIOUS

PDF

123.1 KB Created: 2021-06-18 15:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ddbb6d8e455b8e48c054dd4692d9c9d3 SHA-1: ca709dcbead14135bb7cad15734c6068a12c8681 SHA-256: 0164d05e5a3f9fc8bb86a1ee0c38bd34b47bb7759ff5cefec7a7084d70f6e9d5
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 0.9997

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://irlanc.ru/uplcv?utm_term=my+little+pony+season+7+torrent PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6bc7bde5---50647841177.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/33bac5a29bb006a25f6f5af3a4302ff5/30969940920.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609042862a90c---14861070896.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3sair29rbqmmc5mnsc83hluju7/70612124865.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gomukused.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hkqk906ioi6kr70hpcml29deo5/buvixetekogufef.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/wedivemunisamiluv.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/pawedevapodabowikinulaj.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac83140638---10715616832.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rmerh9j19llgb1g88bg96lh5s6/41594975184.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb34582e730---jidogarofetozotugo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0135be1aa---zaxewo.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874b7eab37---lagexixaruzegalaku.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c864a58a9e4---46434708094.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/c3kacp45tbh9vbj31asnbh8ugt/sovivijiniluxede.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dfpl1hfq89akn6fmbqrp6dsstn/31851196852.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160987708b23db---bududadulomujigixelezepel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
stream_002_off0000dca2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDCA2 57952 bytes
SHA-256: 0f0971317ed556e24b50838fcac903d31667939273340e1bbc555d421b6ad908
font_01_sfnt_off00018bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BCB 5000 bytes
SHA-256: 73147a1053a528e25718207027009b99ff7f72c1ea169ecc415b9225f1131d84
font_02_sfnt_off00019cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CF5 12528 bytes
SHA-256: 59c51a25f656cbfcb53720b4485e0da7bac45cc8bd71502b76b682edfcb4b439
font_03_sfnt_off0001c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5E3 17024 bytes
SHA-256: 2349615851f15495f6499b467ea813e984ad2f1651d11597c94834cc088c5da7

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