Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a78f0b51525220…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 18:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ca10e1a6b459191e941a2498c377513 SHA-1: 34dbbfc8e5d8751ec1d21b695f17df57d6311c10 SHA-256: 75a78f0b515252206c341ffea8c11ad2e85da90c203258c0d13bf8efdaf06896
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98d69bdb2---66943166865.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/r1cg3jlb23d435669mf31ipdf4/20143177141.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0cc0a197d7c07a0500f0b1e1b7cce7eb/pefimitutudibodeg.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/53173757543.pdfIn PDF document text
    • https://domilot.com/uploader/files/91054489389.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/gumifi.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/18257990425.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64337982a---97053930303.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/10228305227.pdfIn PDF document text
    • http://newo.ru/files/files/megogurafopivaweli.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/75568179115.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611256ca9a085---waranubuwugitexurolabag.pdfIn PDF document text
    • https://duvanco.be/docs/files/viromavibipubuf.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/sufudafulopelawa.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43807ce6a---wobuwuriw.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/bemeradofezezowegomev.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/vanit.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/14287691714.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eede7914d0---84856969122.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tixudexof.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/jodatodewerub.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c5a95fe647097435c19c57eb0f2fde34/41207762109.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/kimisupoxilediranagefa.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/moguroserenivalaziz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/493sucjfgk5asi5kdfs2bujup4/ketif.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/laputuniw.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/145812892460a1330c657fe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ai+drug+discovery+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_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 10648 bytes
SHA-256: 6df9490aa28b641b122a64dea03aeb7e8403f8b51d1790080e5dd0734e9c368b
font_01_sfnt_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 16424 bytes
SHA-256: c6ca2429d30c8b44a7ad5f2d1211015387e591ea12c9664dbc8a06df2579e385
font_02_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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