Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5d17ce8b0b2e91…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 01:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 235be08cd313030f8cfc1609ae1248e4 SHA-1: d0956f63395a63430739483958a7a90f9be94b96 SHA-256: 7b5d17ce8b0b2e91db89bf6e076ff3cd24492e4bb7e2a5cec1080019b87902f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm, with multiple distinct hosts, further supports its use in a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a5be65803e830bc9729dd3d7143dcf85/95784265727.pdf In PDF document text
    • http://dd-eng.com/files/files/30574941034.pdfIn PDF document text
    • http://gptools.net/userfiles/file/koduwabowerulagolewopapep.pdfIn PDF document text
    • http://dla-pracownika.pl/pliki_user/File/foxolinez.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/rulufasagazafaje.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/24414108231.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/14719265358.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d1fa10b9---85629209380.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607895acf2446---webaxuxawizukekogap.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/kivan.pdfIn PDF document text
    • https://nasikampung.info/contents//files/73308916880.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0392bd0f---zudik.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/1rfvvqkqdolirhf9hdfvqne69d/5873726830.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210716_A195469942618422.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mojizoderibe.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/40658489155.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/86033244973.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/44046741286.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/75672889104.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8754c9939d5c17a0a4ae2ad6994859a0/76265861761.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/rofalakolatelodivog.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867211ac2c9---jatidizerugimad.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e28070105---79129441195.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/17947922621.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf803c66a---morolijawotamuxuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=definici%C3%B3n+de+lista+de+cotejo+pdfPDF 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_off0000b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB894 16300 bytes
SHA-256: 201f2eae4b3bfcaf28c18dd54b97e0fa785205cb38fd3b32cbec6175953a75be
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 10780 bytes
SHA-256: d96823c869684a670a095ce25449debf9a48e9b053c2b15a1d0f89be1d3539f9
font_02_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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