Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf3c2590beb0bf6…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 00:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9820f0b15e495e453ffb20aa686ca0ac SHA-1: 469ad066b92f08942b40ac02495dc78eb8c07703 SHA-256: fcf3c2590beb0bf6d20ca1db00691cdbc5fed28788ca0ae5a7961b99ad8bf97f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the phishing lure. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cmrivestimenti.com/userfiles/files/vosat.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb34151309---33703337273.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021092219465673499.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/vibiwav.pdfIn PDF document text
    • https://protum.se/file/38015556613.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///xuposi.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/gazexevito.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/dowexuzo.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/wazaruj.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130440c8d617---sokokefikejorizelapuko.pdfIn PDF document text
    • http://kleiberit.ru/files/file/tofawokalusom.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613109411dc23---15186435699.pdfIn PDF document text
    • http://iucecb.com/files/file/26497557260.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/pedesiwanolak.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/42210409980.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/61118635709.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/nosuvibozaf.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/zaxaxotosa.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/d8c5bb98214109f23eedfa7493d61d80.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/kikipojosiwamote.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/9748399046.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/pemujejudevowafidorusi.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109151716351774.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210904_100941.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/panajaxoburexuj.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/finivasebugivirafuvej.pdfIn PDF document text
    • https://zhansq.cn/upload/file/41589630848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+harrison%27s+principles+of+internal+medicinePDF 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_off0000bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 15556 bytes
SHA-256: bf7d574196478900e0f8c7b22fa077e4b17664ec3c3feb21364e1f0389e1fea9
font_01_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 11008 bytes
SHA-256: 762f69c4eb7536714afc9f4858c34e6c8bd64dde2cbc4f4895e63ba48d5eee96

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