Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d85b5245d913efc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 08:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c15ea14a1edf5f6307889a40de743d9e SHA-1: 8696a04e17a4633edd73479925a93bbffee2996b SHA-256: 8d85b5245d913efcb7429ec0eb6a312c42a82c38f8bd22ae710e9f6a88c63f7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating a likely attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/39sdnug7usmgukqgp2jjc73gtn/zetuwekorivinus.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed4b231b4---64722213976.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/1166049545.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/76004233460.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7512c111e5---gixegof.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/55da075f79e7700b1b76c05f78414d45/sumatafolikeriwabavoxegol.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/laxunujesuvo.pdfIn PDF document text
    • https://12tiga.com/contents//files/femadegerogudutulurerew.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///72618139927.pdfIn PDF document text
    • http://rc-modeller.se/images/file///gokipi.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/97728177631.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/mugulu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8272893d04d8424b820d22fcc44072b6/rumonisevidetuso.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d40e48b2bdc9784e5720de3bd00e251/4414274080.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sizunefujoxiwikulatexuzok.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046fbafa5---65161320165.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/51514766650.pdfIn PDF document text
    • http://www.og2c.com/images/file/judusepumafetabovowin.pdfIn PDF document text
    • https://path.mn/userfiles/files/pavab.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9leqa0lv4o42mmhdpfvc6lp5dj/1476663796.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/3jtnot638duth6lva9vqbg26o0/78173497447.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890b9967b60---61577260081.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/beludopexidapipixawiru.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ihf5i97ik13gat9tgn1at06g2/pexoxegenagalutupula.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/kijap.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e8f7eb01a---zarixebopadeteviko.pdfIn PDF document text
    • http://islandpointfl.com/userimages/jadajokobusezevolofevone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wow+shadowlands+costPDF 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_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 10220 bytes
SHA-256: f8c76154d704341c527884a4a0d26f7531c2c87bdf051d5441048639a2e3cd35
font_02_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 18888 bytes
SHA-256: 7e07dd1330229ab724e672ddf730afc126f0ae98937c15ed5ef5d00379cb9bac

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