Malicious PDF — malware analysis report

Static analysis result for SHA-256 511c220996c0439f…

MALICIOUS

PDF

106.4 KB Created: 2021-08-01 13:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d436edfb09f43ecd671d9343010620da SHA-1: 8ff50cd9e9804625a984f427df3621b67a2f3dce SHA-256: 511c220996c0439fa7ef0ab1470a8f95d480cfcda7b9b9f778d2b2c66d485377
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous external URLs, many hosted on compromised CMS upload storage or disposable domains. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 http://ellerbeefamilyreunion.com/clients/874543/File/1991844253.pdf In PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/fapejinebozatuxusum.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/zumukigesoxisinisekavo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/38171450110.pdfIn PDF document text
    • https://proxus.nl/file/vogomeselapufafeworiremu.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/madebimo.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/92560615314.pdfIn PDF document text
    • http://thaide.org/userfiles/file/dopelugiwuzobu.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/54823415072.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202162918471.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0a50ca92---35938433404.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f972e86b75---bikoxofowotawala.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/21527573642.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d451d7fcf6---latajerawoj.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d8d7d6657---tebamedikuzebovijavikimuw.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/84069806084.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/sibemoxokeberirikedosax.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/86339868244.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a69cad1e14a---42772342986.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/69510908643.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cade041c69d---rudokakobekuvi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851f952b5a7---39699513510.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7333a5314---26493924527.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1pkesidao1u7n63av9cjvnibp4/puxefipusos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=o+curioso+caso+de+benjamin+button+livro+filmePDF 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_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 20372 bytes
SHA-256: 0e1aa00c26dcfa35319a44947b42ee350128f9a40c58e4921861d8980e838c5f
font_02_sfnt_off00016748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5F 11100 bytes
SHA-256: a93167a7491fc43a1fa884be574e93113d05d0e3e112c8faabf5e8e718b0c823

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