Malicious PDF — malware analysis report

Static analysis result for SHA-256 93eb4bd6ef85ba24…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 21:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f451253bde4dbaf915f080daf44d78fb SHA-1: 77287c5af34a53c0fa51650c2dba89373e9eee61 SHA-256: 93eb4bd6ef85ba2470bb093d4570113adef02eaf137aff45e0dc2d9bb2812e82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://yksskj.com/ckfinder/userfiles/files/94786745460.pdf In PDF document text
    • https://toananhmedical.com/uploads/files/56616642546.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614202142b147---46973325841.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/goxarukikosimufusij.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/57363131195.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/81621725720.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/15291036768.pdfIn PDF document text
    • http://yanartextil.com/firma/files/zojadefalaluzenuvelasen.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/bexemisuzolanufuxanududem.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/dekubasefakadif.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f537e1e32---6064778649.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/gesefixero.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/dejajibigunilokoloma.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/finebugilabi.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/tijezopaf.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/45748370096.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/buzalaja.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8ecf3ac8---5428926079.pdfIn PDF document text
    • http://poorclarescork.ie/images/81316884636.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/82556165470.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109030246138439.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/90111340862.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161427ca1334a1---75004418194.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/gapisabojinamo.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/jalivolesamulufuxelawe.pdfIn PDF document text
    • http://dgkno.cn/upload/82567155163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=power+shade+appPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 19148 bytes
SHA-256: 6b0e44bf75815e0d397554789ea7d63af6814744345379342f718ae357abb4be
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 10236 bytes
SHA-256: 2a5ded8a91ed22dd4f08a653dbb62b43a9b48416aa0655ad853ac7e279c5abb4
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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