Malicious PDF — malware analysis report

Static analysis result for SHA-256 52834abffd507916…

MALICIOUS

PDF

94.4 KB Created: 2021-06-19 20:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc5026cedb41024f368b34c6f0dff1eb SHA-1: 7de308c0fbf858545cbda778e1eeabb3f4dcc893 SHA-256: 52834abffd50791669bda80336b757c142e79e487030ff3097f4e77a0ede1f3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The document body, though heavily obfuscated, contains references to 'torrent magnet' and 'need for speed carbon', likely a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7fc41d3b125daa21d404945d9e86d912/mefurepimet.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc78b12a9---mofexewozul.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/fikojadimidusesofajela.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40eab94d7---koname.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/83001411283.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763b76412b9---gerigerusapuzukof.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46139e593---lotuwefatajijifusen.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/83290254788.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/jegepoke.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xeforonez.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/47533769223.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/25752286311.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160793a4260085---gubosajafefapowikev.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070df00d5815---vuteresakabiboro.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/uvg3boco3jum76odsofrs7r1g3/49327329867.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1e532408b1ffa33cfe515f20b2bde8de/92339933170.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
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=need+for+speed+carbon+torrent+magnetPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14241 17492 bytes
SHA-256: 5a72dc2317467a82e476004e15fe3195b32bcc1e8bb53206480f8a25b0644333
font_00_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 5292 bytes
SHA-256: 121ae9406a742a0ad1c71b22b058d25558f9fad0b83dd26bcc06de6fe41c29c7
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 13056 bytes
SHA-256: b2cb05b68c3173d02e284f60bf4c6d07a1933811be5f9690bac3a3e28037e9fe
font_03_sfnt_off00015bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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