Malicious PDF — malware analysis report

Static analysis result for SHA-256 412b82a1f78027b3…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 21:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86a795d8fa2709429454d63e89b5b0c8 SHA-1: 2e1d53fdbb03d0c429b202af83b00bb7f1ed6d7c SHA-256: 412b82a1f78027b35d332a40434df433031a93d08de1b6fc2f4b8ddfae59d758
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to PDF files hosted on potentially compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=dls+2019+hack+download PDF link annotation
    • https://sistemkabin.com/ckfinder/userfiles/files/xodupazi.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/maxiwotunizoz.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/mumemelilukozu.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/48952729474.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zimimumuxopisu.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/zusalatimofafazuvidunudik.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/zironuvefijolososemaz.pdfIn PDF document text
    • http://signauction.net/userfiles/file/22277625854.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8896ae36a1f584a29f61fcb06d2e82f6/fetaresatotugitukowubaze.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/53310879789.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/buwetosevukajupin.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/gukubowelejiwiwinomuzos.pdfIn PDF document text
    • http://atrsara.ir/resource/files/betuwazar.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/fedonajuradopelemidubofo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16146123cd5e1f---jiluzudat.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bpq5hl1488bpgq1sel0lgngff4/juwatuzokewonoxagorajufi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///51851612727.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/tugezatamotowe.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614038ae7efbb---xekexibezatebagunavin.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizufotovuvexo.pdfIn PDF document text
    • https://12shio1.com/contents/files/85858568364.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0903/67e00cd362a91c360a8f98762cf107f2.pdfIn PDF document text
    • http://irinabailey.com/upload/files/kusufolugirunugokosinoga.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15f14cb2e2ec9ff22f274565ffebc27e/jelabopumosibefopeze.pdfIn PDF document text
    • 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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 10684 bytes
SHA-256: e571a069b791d6acece0a745f649784d49a89800a92fbdfa830559133d1174e1
font_02_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 18444 bytes
SHA-256: a25442655ced80663651669b09429828336df505989b37d6a018f30ff413ac24

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