Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f0ddeae92dea1d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 04:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 27ad81725d53f587d0c327cfc548ecf4 SHA-1: 9a2f344dd4ee159728d28535b8123aca80095b63 SHA-256: 89f0ddeae92dea1d2baf6f7d67557148ad937b4a9e25a5d1a22c72699f5440eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This structure suggests the document is designed to act as a link farm, likely to distribute phishing content or lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://abwpetersburg.com/uploads/files/70995529088.pdf In PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/83527786399.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/voximi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4ip68g5um6meh5pj7b07qlaa05/xurezevabereju.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91cb6e2e9---33547689624.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1bb0d55c---tesawuwodoposozukofena.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/demadufugamafokovekitib.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/74684425465.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160828d3199a7d---7490782041.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/lezigisexudomuxerasuvalaj.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nilopetujixiliwepopuxil.pdfIn PDF document text
    • https://bloc-immo.com/images/xubakudomamovod.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/47458734934.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/10931107297.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085902420d62---31276333295.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/34029599731.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/zibufute.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/26695912428.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d137fccdc5---jemoximoxegiw.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5de85d487---53263519412.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021080420455273499.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5bb67a380dc68b0be444d74bfebf99bd/58517524936.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/42482829717.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/puwamagewolubet.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/28379852911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=planos+pdf+gratisPDF 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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 10540 bytes
SHA-256: a25938a060d800a4a40a663093fc1c9e196aa81e99abdd33071ab8fb5ed0c12c
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 19380 bytes
SHA-256: 9ff0bfe365a84547975a2e2bebb41ae67f2bb0d4ceb337e73b24a463adb99a29

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