Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a8efe3e4ec281b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 09:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2525bbc492767fe19a5f21456c63312 SHA-1: 479f57fc7da68775a6b05b2e297b6de4ae39d64c SHA-256: 78a8efe3e4ec281b0736a96329604cc184910cbb3063029e8dbc313ecdcdb975
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/dotarun.pdf In PDF document text
    • http://www.chubsorn.com/file/files/73838170597.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/67557932700.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cpr524cekf1flqphegumqja2cn/5820159410.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef41952fea---28424809183.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuvakarinoburipezekupew.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/95371550429.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/62461180767.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/pisitevavopufurusotiw.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/48951840726.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/43807d01f10d627547b1be067d10f61d/1117851831.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tikatulifirixavatimumijak.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210810_064437.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jevij.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/ranesajif.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/duxiroviwinunuganix.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tufozodo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fbb9193e33075ed0f16b948f092286f8/kariwepotiba.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4jv8nn01fpuuhsl05h68je4tk7/24302144203.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/puhh969pmirieelnfg58f59u9a/wolavilanegirupevaz.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/92156054598.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/mexezozowakigafunux.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/fabogomopewepefita.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kubewav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=microsoft+bluetooth+notebook+mouse+5000+manualPDF 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_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 17584 bytes
SHA-256: 192bcbed37be4b4266bde1d0b97f0934c9b086c10e299c1d7e22dc3f32196738
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 11180 bytes
SHA-256: e9c8a4c13db8758e7ed08270fb1a3fccd2dcd7bc1b8e7eef6eb4c6520305c1e9