Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e871569663ee6e…

MALICIOUS

PDF

96.6 KB Created: 2021-09-13 15:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 758522c7ec1876dcd5018c8b64f12224 SHA-1: 5c7703b467c266e8858168aec80f94ad9f646244 SHA-256: b7e871569663ee6eb27c3a77b1b2bfab1be2e0d3c774d6b8910bea2af33522c7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://mudrkanuch.sk/editor_uploads/system/files/mosewaregeja.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed57571cf0---89735410184.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/bgje732eb7inouge3e3k9e9l0q/51069193478.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/74122577300.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/muledegapo.pdfIn PDF document text
    • http://slsnn.ru/content/files/59502149435.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/3584786232.pdfIn PDF document text
    • http://tid.vn/upload/files/doxuziwekivivipoxib.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gasakarepupodetisex.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1d2933e2081b31b60de793d13f0b8397/tefab.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/goragapidivetewadamesi.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/95653800699.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134953eae4d6---paxeraxup.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/23703674224.pdfIn PDF document text
    • http://innotack.com/userfiles/files/95799938778.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/sajagufefeneza.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e919e49a---80794293377.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/86350621648.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nezetotijowozudijupip.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906042027905.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/xawutuxefufe.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/buvijikajadijazorejiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=asus+nexus+7+2013+firmwarePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 10896 bytes
SHA-256: 7b1aa6d3f665ccf91c43506f231324c582effdf98d843e97afa696cdd28f44a6
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_02_sfnt_off00011fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB8 23488 bytes
SHA-256: a258eee890ba46123545a9dcbb12ccea5e7e03a32d38f1160c18eb8949318b4d
font_03_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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