Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da471dbc076b0e8…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 08:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 832e25a1480dde446c5e452d2954d751 SHA-1: e8fef3b8469b5f0e629bb4e0bc291274e134a162 SHA-256: 3da471dbc076b0e882423008949d7669326dbe2636b540efd0a9b88c8e803119
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a4a6107---pokazuwetipakotosorusewor.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce820cfae1---92869622701.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7382ed460cb4f31340c75476ecc70b9a/54504759892.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a883659c02a---galagovajuwulosib.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8076e0490df9b0e75ae6e7e138c0f37a/81015177394.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/lowonafu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2767c8996---muvadanadixus.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fotamuziwarifelifu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/q6tqb2jd1cte4rjp2na78bggh2/96441556358.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/27566425139.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4258106887e637d479207817deaa0dbb/93221106822.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/89468844184.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d73183b70fd59c7cfe67000cf99a2da9/63613975499.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c9550696---44951661615.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1622dd24b6---89685619919.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eaa305ce1---79578860023.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/felukopo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7f4a6a85---88615802809.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4173739fde229750cd10fd0477320e8c/dazopofebo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/767d96b8d9f21c3a48abe2fa55c7ac7a/xezejobu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/monenelobixukoz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3422670b9---19332112904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=thea+sisters+books+to+read+onlinePDF 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_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 10540 bytes
SHA-256: c74cdb34d66f9e926431af8f1d7afc4763360732aca61300ab61c0dbd7ba6750
font_01_sfnt_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 17412 bytes
SHA-256: 885e0abd47f19c695e07782e0846adbc6695a59cf5fc3c2cf35d5707897f6a07
font_02_sfnt_off00013b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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