Malicious PDF — malware analysis report

Static analysis result for SHA-256 2351803fbdc1b1d4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 14:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd5c17fdb6e26ca062201c2e4fcfb19a SHA-1: 7d11e6bbf8e8835b8ece7b1e683a7ddd811f3db4 SHA-256: 2351803fbdc1b1d45a57de6e150e7d81d4ad810ae4486ac9a2f948e7f9c8dddd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary intent appears to be phishing or scamming by luring users to these external sites under the guise of providing information on electronic components.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/o9a7ejvch23q39a58jednj7en0/23477685122.pdf In PDF document text
    • http://sbnjl.com/userfiles/files/sajugurivab.pdfIn PDF document text
    • https://ancoraeducacion.com/images/zelejiwozujuwoditid.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/7708991377.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/wugasutugutufema.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/wizosem.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607234b70744c---wotomojezakanujumivate.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/nadedorokuxazagisaborowod.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeff10a4aa---48410527821.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xukedogot.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/sopejobidigazu.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021072611592585.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/dfc362a303474418eb0de0cbbefe6666/12220088377.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/27367334073.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/75793457000.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f5e6d397---perivatifotiloxuz.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c731cd22ae0a27f96ad5f8cc5169a4d3/wiwofufesisabatut.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c018b01c---bepabudojol.pdfIn PDF document text
    • http://orderkai.com/uploads/files/89383650738.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac622998279.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/puwetuvizilawulega.pdfIn PDF document text
    • http://apcmagon.com/userfiles/89275698916.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/wutililade.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/30949705483.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/kogigag.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/libur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=make+encyclopedia+of+electronic+components+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_off0000b47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47B 10980 bytes
SHA-256: 45a262594cee48bea308286616e09ffe66a77e94cb1ed2170c7ed57193c42e52
font_01_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 15532 bytes
SHA-256: d390644ac0b2174c26846b01ba01e4dd5fec94a4cc49c0463762ee9abe28739d

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