Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1253b7b5a1eba9b…

MALICIOUS

PDF

90.7 KB Created: 2021-07-13 19:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 82bdd1b7b154cc4aa9657c9cdd596e34 SHA-1: d4ae73786b9587be4f00e59619c275ca7f972b7d SHA-256: c1253b7b5a1eba9b6c4ec55567615eb71705fa2671cea5f6f5d37cdcf022ab1e
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160900d68c1fd6---36152086933.pdf In PDF document text
    • https://aulacvn.com/upload/fck/file/xuzebetokavusubotulo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/92202123434.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d7c59683347dbc19767463666675b0f2/50036377757.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/wadilineborimepetujilega.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/xuresiwenoragit.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b54856559b20553bbe16343a687051d5/gokogisuredemaxute.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895732d0fc---xisibukadanujojuvixevemop.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gj1a36s70q3d1rs5psg0i3fchh/79349335467.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6185c9512---20624838831.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/8930813744.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d5944a1f---78573162418.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f551c0652c---nexafa.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/259520854d0e25cdcfaf536f19ba9e6f/10956299278.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/90a234279348787936af22aec0c59940/91973470364.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160daa21567b9e---38862112745.pdfIn PDF document text
    • http://st03.it/userfiles/files/87865009624.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/nigidemapapi.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/vulerediludepened.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/feca35bc2a043c1ed58ef94ce9e1f7b0/286286811.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/zopidibiwivomumiloxu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/jabuputerapaze.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/7c04b033dce6f8fac010bc1d7cd2e7be/88538030906.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/24803625561.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5241cc87a7---sinanopalalax.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/vabosoxesurekuvajaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oh+my+god+full+movie+download+in+tamilPDF 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_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16920 bytes
SHA-256: b9211cdd2257561773417f1933dcbb1ba798ada0aa7a726381c1c1ea5603196e
font_01_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 10924 bytes
SHA-256: 78ce3914d4450177f74ab61da6c1c31e9903e545e2ab3bb177b8a079384d5b43
font_02_sfnt_off00014529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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