Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ff7f06029f12f2…

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 18:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d2c226a48e1ef0635e9db27935987ed6 SHA-1: 1cb1363a0c8b19b9a3fc6692e5f961d40d7da38b SHA-256: f2ff7f06029f12f238158628ef83035495ca658b9718026ba41186461b685b67
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a2d92afc80aedd3bd4e4e9250afd9cf5/4446233817.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094308dc81ad---89310810698.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/futizedutojitikepap.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ngphleb0hbt0365o7bsvn9i41r/53200138067.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9298438a2---kapixanena.pdfIn PDF document text
    • http://ibb-online.ru/f/file/nakafed.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc145acc19---xalegi.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/zifofifutuxesaw.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/54ff2dabb532f377266790d0bf10934a/nogokop.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c9cdf2686d874fd59cbc526ff9cffa94/rifijedumuxunogogadide.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/dadegiwumos.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/20491329440.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97b144638aeeb63ca1a6ee9846ad94ad/tavezonevato.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wuvenex.pdfIn PDF document text
    • https://immobilgold.com/file/39463931797.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608480e563959---70541762945.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984818677c2---fuverubovejesujo.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/39520824417.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/surabojujemeravetal.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/88028818325.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/difad.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/gekiririranenem.pdfIn PDF document text
    • https://jagominum.com/contents//files/79261409540.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///6081125647.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee28a9391---fukinogewopagosonitola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=oops+in+c%23+interview+questions+and+answers+for+experiencedPDF 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_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 9852 bytes
SHA-256: f47310795f565d07a9fc689effc89e34cc0ad1b3b06bd5cce7251c6dac6b255f
font_01_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 18060 bytes
SHA-256: e6351ff1ffc6bb9a09e65970df9af925b47b3d0190071d51dd0d932ac070c3cd
font_02_sfnt_off00013b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1