Malicious PDF — malware analysis report

Static analysis result for SHA-256 43696f9662dd78fa…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 05:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ed0feaf4d7359cbbbd8f47b2f2bb054 SHA-1: b71bc1a65ef25ee7a56a030b9d9525af994d2cfe SHA-256: 43696f9662dd78fa0ba7beed96678a1cbf489c35742fe9b789d0dd108e671d5a
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various domains, some of which are associated with compromised WordPress installations or disposable hosting. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=a+positive+word+that+begins+with+k PDF link annotation
    • https://ratodua.com/contents/files/ruxuruburefimadebavazigu.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/jijapigetanepepugexe.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/tozegekane.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/dapiguvizesikovatipalemi.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/83070010645.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ec3a6f74---kepegowulud.pdfIn PDF document text
    • http://4bx.pl/public/file/51596209650.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/33406086135.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/85218200917.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/panib.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/14a886e93fa2c018470f8d95d56bb853/14323721608.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210917043400.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/tulugategexikojuwojim.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/berupixoliza.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/99378442866.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/41173723886.pdfIn PDF document text
    • https://phuquiland.com/upload/files/posade.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd2b7624d---zalodixemiwi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c5c18c376894d4a145ac8a07fef058b9/mowawudun.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/supifolutixunifunudewof.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130023118b37---xagefutuzoxavesopemom.pdfPDF link annotation
    • http://siblom.ru/files/upload/file/gixadurorovof.pdfIn PDF document text
    • 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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 10988 bytes
SHA-256: 6800fc56e2e5e0ba77ba345d811373a4a7b3b9b1f5d88ce622e66fb8b05f4269
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 17832 bytes
SHA-256: ce8ce82ec31b2a259d6f2c8864c512fa0c05ca9726cbee884ac0c2e78ef18bdd
font_02_sfnt_off000131d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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